ffmpeg / libavformat / avidec.c @ ded3c7da
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/*
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* AVI demuxer
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* Copyright (c) 2001 Fabrice Bellard.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h" |
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#include "avi.h" |
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#include "dv.h" |
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#include "riff.h" |
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#undef NDEBUG
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#include <assert.h> |
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//#define DEBUG
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//#define DEBUG_SEEK
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typedef struct AVIStream { |
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int64_t frame_offset; /* current frame (video) or byte (audio) counter
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(used to compute the pts) */
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int remaining;
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int packet_size;
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int scale;
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int rate;
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int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */ |
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int64_t cum_len; /* temporary storage (used during seek) */
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int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b' |
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int prefix_count;
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} AVIStream; |
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typedef struct { |
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int64_t riff_end; |
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int64_t movi_end; |
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offset_t movi_list; |
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int index_loaded;
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int is_odml;
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int non_interleaved;
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int stream_index;
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DVDemuxContext* dv_demux; |
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} AVIContext; |
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static int avi_load_index(AVFormatContext *s); |
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static int guess_ni_flag(AVFormatContext *s); |
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|
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#ifdef DEBUG
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static void print_tag(const char *str, unsigned int tag, int size) |
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{ |
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printf("%s: tag=%c%c%c%c size=0x%x\n",
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str, tag & 0xff,
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(tag >> 8) & 0xff, |
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(tag >> 16) & 0xff, |
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(tag >> 24) & 0xff, |
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size); |
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} |
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#endif
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static int get_riff(AVIContext *avi, ByteIOContext *pb) |
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{ |
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uint32_t tag; |
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/* check RIFF header */
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tag = get_le32(pb); |
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if (tag != MKTAG('R', 'I', 'F', 'F')) |
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return -1; |
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avi->riff_end = get_le32(pb); /* RIFF chunk size */
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avi->riff_end += url_ftell(pb); /* RIFF chunk end */
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tag = get_le32(pb); |
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if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X')) |
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return -1; |
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return 0; |
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} |
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static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){ |
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AVIContext *avi = s->priv_data; |
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ByteIOContext *pb = &s->pb; |
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int longs_pre_entry= get_le16(pb);
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int index_sub_type = get_byte(pb);
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int index_type = get_byte(pb);
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int entries_in_use = get_le32(pb);
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int chunk_id = get_le32(pb);
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int64_t base = get_le64(pb); |
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int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0'); |
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AVStream *st; |
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AVIStream *ast; |
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int i;
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int64_t last_pos= -1;
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int64_t filesize= url_fsize(&s->pb); |
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#ifdef DEBUG_SEEK
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av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n", |
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longs_pre_entry,index_type, entries_in_use, chunk_id, base); |
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#endif
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if(stream_id > s->nb_streams || stream_id < 0) |
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return -1; |
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st= s->streams[stream_id]; |
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ast = st->priv_data; |
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|
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if(index_sub_type)
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return -1; |
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get_le32(pb); |
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if(index_type && longs_pre_entry != 2) |
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return -1; |
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if(index_type>1) |
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return -1; |
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if(filesize > 0 && base >= filesize){ |
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av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
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if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF) |
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base &= 0xFFFFFFFF;
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else
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return -1; |
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} |
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for(i=0; i<entries_in_use; i++){ |
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if(index_type){
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int64_t pos= get_le32(pb) + base - 8;
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int len = get_le32(pb);
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int key= len >= 0; |
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len &= 0x7FFFFFFF;
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#ifdef DEBUG_SEEK
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av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len); |
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#endif
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if(last_pos == pos || pos == base - 8) |
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avi->non_interleaved= 1;
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else
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av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0); |
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if(ast->sample_size)
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ast->cum_len += len; |
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else
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ast->cum_len ++; |
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last_pos= pos; |
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}else{
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int64_t offset, pos; |
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int duration;
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offset = get_le64(pb); |
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get_le32(pb); /* size */
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duration = get_le32(pb); |
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pos = url_ftell(pb); |
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url_fseek(pb, offset+8, SEEK_SET);
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read_braindead_odml_indx(s, frame_num); |
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frame_num += duration; |
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url_fseek(pb, pos, SEEK_SET); |
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} |
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} |
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avi->index_loaded=1;
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return 0; |
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} |
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static void clean_index(AVFormatContext *s){ |
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int i;
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int64_t j; |
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for(i=0; i<s->nb_streams; i++){ |
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AVStream *st = s->streams[i]; |
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AVIStream *ast = st->priv_data; |
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int n= st->nb_index_entries;
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int max= ast->sample_size;
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int64_t pos, size, ts; |
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if(n != 1 || ast->sample_size==0) |
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continue;
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while(max < 1024) max+=max; |
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pos= st->index_entries[0].pos;
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size= st->index_entries[0].size;
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ts= st->index_entries[0].timestamp;
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for(j=0; j<size; j+=max){ |
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av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
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} |
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} |
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} |
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static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size) |
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{ |
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offset_t i = url_ftell(pb); |
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size += (size & 1);
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get_strz(pb, buf, maxlen); |
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url_fseek(pb, i+size, SEEK_SET); |
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return 0; |
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} |
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static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) |
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{ |
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AVIContext *avi = s->priv_data; |
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ByteIOContext *pb = &s->pb; |
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uint32_t tag, tag1, handler; |
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int codec_type, stream_index, frame_period, bit_rate;
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unsigned int size, nb_frames; |
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int i, n;
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AVStream *st; |
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AVIStream *ast = NULL;
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char str_track[4]; |
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avi->stream_index= -1;
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if (get_riff(avi, pb) < 0) |
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return -1; |
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/* first list tag */
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stream_index = -1;
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codec_type = -1;
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frame_period = 0;
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for(;;) {
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if (url_feof(pb))
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goto fail;
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tag = get_le32(pb); |
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size = get_le32(pb); |
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#ifdef DEBUG
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print_tag("tag", tag, size);
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#endif
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switch(tag) {
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case MKTAG('L', 'I', 'S', 'T'): |
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/* ignored, except when start of video packets */
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tag1 = get_le32(pb); |
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#ifdef DEBUG
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print_tag("list", tag1, 0); |
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#endif
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if (tag1 == MKTAG('m', 'o', 'v', 'i')) { |
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avi->movi_list = url_ftell(pb) - 4;
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if(size) avi->movi_end = avi->movi_list + size + (size & 1); |
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else avi->movi_end = url_fsize(pb);
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#ifdef DEBUG
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printf("movi end=%"PRIx64"\n", avi->movi_end); |
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#endif
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goto end_of_header;
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} |
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break;
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case MKTAG('d', 'm', 'l', 'h'): |
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avi->is_odml = 1;
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url_fskip(pb, size + (size & 1));
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break;
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case MKTAG('a', 'v', 'i', 'h'): |
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/* avi header */
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/* using frame_period is bad idea */
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frame_period = get_le32(pb); |
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bit_rate = get_le32(pb) * 8;
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get_le32(pb); |
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avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX; |
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url_fskip(pb, 2 * 4); |
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n = get_le32(pb); |
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for(i=0;i<n;i++) { |
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AVIStream *ast; |
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st = av_new_stream(s, i); |
273 |
if (!st)
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goto fail;
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|
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ast = av_mallocz(sizeof(AVIStream));
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if (!ast)
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goto fail;
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st->priv_data = ast; |
280 |
} |
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url_fskip(pb, size - 7 * 4); |
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break;
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case MKTAG('s', 't', 'r', 'h'): |
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/* stream header */
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stream_index++; |
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tag1 = get_le32(pb); |
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handler = get_le32(pb); /* codec tag */
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#ifdef DEBUG
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print_tag("strh", tag1, -1); |
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#endif
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if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){ |
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int64_t dv_dur; |
293 |
|
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/*
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* After some consideration -- I don't think we
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* have to support anything but DV in a type1 AVIs.
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*/
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if (s->nb_streams != 1) |
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goto fail;
|
300 |
|
301 |
if (handler != MKTAG('d', 'v', 's', 'd') && |
302 |
handler != MKTAG('d', 'v', 'h', 'd') && |
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handler != MKTAG('d', 'v', 's', 'l')) |
304 |
goto fail;
|
305 |
|
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ast = s->streams[0]->priv_data;
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av_freep(&s->streams[0]->codec->extradata);
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308 |
av_freep(&s->streams[0]);
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s->nb_streams = 0;
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310 |
if (ENABLE_DV_DEMUXER) {
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311 |
avi->dv_demux = dv_init_demux(s); |
312 |
if (!avi->dv_demux)
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goto fail;
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314 |
} |
315 |
s->streams[0]->priv_data = ast;
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url_fskip(pb, 3 * 4); |
317 |
ast->scale = get_le32(pb); |
318 |
ast->rate = get_le32(pb); |
319 |
url_fskip(pb, 4); /* start time */ |
320 |
|
321 |
dv_dur = get_le32(pb); |
322 |
if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) { |
323 |
dv_dur *= AV_TIME_BASE; |
324 |
s->duration = av_rescale(dv_dur, ast->scale, ast->rate); |
325 |
} |
326 |
/*
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327 |
* else, leave duration alone; timing estimation in utils.c
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328 |
* will make a guess based on bit rate.
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*/
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330 |
|
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stream_index = s->nb_streams - 1;
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332 |
url_fskip(pb, size - 9*4); |
333 |
break;
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334 |
} |
335 |
|
336 |
if (stream_index >= s->nb_streams) {
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337 |
url_fskip(pb, size - 8);
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338 |
/* ignore padding stream */
|
339 |
if (tag1 == MKTAG('p', 'a', 'd', 's')) |
340 |
stream_index--; |
341 |
break;
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342 |
} |
343 |
st = s->streams[stream_index]; |
344 |
ast = st->priv_data; |
345 |
st->codec->stream_codec_tag= handler; |
346 |
|
347 |
get_le32(pb); /* flags */
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348 |
get_le16(pb); /* priority */
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349 |
get_le16(pb); /* language */
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350 |
get_le32(pb); /* initial frame */
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351 |
ast->scale = get_le32(pb); |
352 |
ast->rate = get_le32(pb); |
353 |
if(ast->scale && ast->rate){
|
354 |
}else if(frame_period){ |
355 |
ast->rate = 1000000;
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356 |
ast->scale = frame_period; |
357 |
}else{
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358 |
ast->rate = 25;
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359 |
ast->scale = 1;
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360 |
} |
361 |
av_set_pts_info(st, 64, ast->scale, ast->rate);
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362 |
|
363 |
ast->cum_len=get_le32(pb); /* start */
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364 |
nb_frames = get_le32(pb); |
365 |
|
366 |
st->start_time = 0;
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367 |
st->duration = nb_frames; |
368 |
get_le32(pb); /* buffer size */
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369 |
get_le32(pb); /* quality */
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370 |
ast->sample_size = get_le32(pb); /* sample ssize */
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371 |
ast->cum_len *= FFMAX(1, ast->sample_size);
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372 |
// av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
|
373 |
|
374 |
switch(tag1) {
|
375 |
case MKTAG('v', 'i', 'd', 's'): |
376 |
codec_type = CODEC_TYPE_VIDEO; |
377 |
|
378 |
ast->sample_size = 0;
|
379 |
break;
|
380 |
case MKTAG('a', 'u', 'd', 's'): |
381 |
codec_type = CODEC_TYPE_AUDIO; |
382 |
break;
|
383 |
case MKTAG('t', 'x', 't', 's'): |
384 |
//FIXME
|
385 |
codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
|
386 |
break;
|
387 |
case MKTAG('p', 'a', 'd', 's'): |
388 |
codec_type = CODEC_TYPE_UNKNOWN; |
389 |
stream_index--; |
390 |
break;
|
391 |
default:
|
392 |
av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
|
393 |
goto fail;
|
394 |
} |
395 |
ast->frame_offset= ast->cum_len; |
396 |
url_fskip(pb, size - 12 * 4); |
397 |
break;
|
398 |
case MKTAG('s', 't', 'r', 'f'): |
399 |
/* stream header */
|
400 |
if (stream_index >= s->nb_streams || avi->dv_demux) {
|
401 |
url_fskip(pb, size); |
402 |
} else {
|
403 |
st = s->streams[stream_index]; |
404 |
switch(codec_type) {
|
405 |
case CODEC_TYPE_VIDEO:
|
406 |
get_le32(pb); /* size */
|
407 |
st->codec->width = get_le32(pb); |
408 |
st->codec->height = get_le32(pb); |
409 |
get_le16(pb); /* panes */
|
410 |
st->codec->bits_per_sample= get_le16(pb); /* depth */
|
411 |
tag1 = get_le32(pb); |
412 |
get_le32(pb); /* ImageSize */
|
413 |
get_le32(pb); /* XPelsPerMeter */
|
414 |
get_le32(pb); /* YPelsPerMeter */
|
415 |
get_le32(pb); /* ClrUsed */
|
416 |
get_le32(pb); /* ClrImportant */
|
417 |
|
418 |
if(size > 10*4 && size<(1<<30)){ |
419 |
st->codec->extradata_size= size - 10*4; |
420 |
st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); |
421 |
get_buffer(pb, st->codec->extradata, st->codec->extradata_size); |
422 |
} |
423 |
|
424 |
if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly |
425 |
get_byte(pb); |
426 |
|
427 |
/* Extract palette from extradata if bpp <= 8 */
|
428 |
/* This code assumes that extradata contains only palette */
|
429 |
/* This is true for all paletted codecs implemented in ffmpeg */
|
430 |
if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) { |
431 |
st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
|
432 |
#ifdef WORDS_BIGENDIAN
|
433 |
for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++) |
434 |
st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]); |
435 |
#else
|
436 |
memcpy(st->codec->palctrl->palette, st->codec->extradata, |
437 |
FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)); |
438 |
#endif
|
439 |
st->codec->palctrl->palette_changed = 1;
|
440 |
} |
441 |
|
442 |
#ifdef DEBUG
|
443 |
print_tag("video", tag1, 0); |
444 |
#endif
|
445 |
st->codec->codec_type = CODEC_TYPE_VIDEO; |
446 |
st->codec->codec_tag = tag1; |
447 |
st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1); |
448 |
st->need_parsing = 2; //only parse headers dont do slower repacketization, this is needed to get the pict type which is needed for generating correct pts |
449 |
// url_fskip(pb, size - 5 * 4);
|
450 |
break;
|
451 |
case CODEC_TYPE_AUDIO:
|
452 |
get_wav_header(pb, st->codec, size); |
453 |
if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
|
454 |
av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
|
455 |
if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */ |
456 |
url_fskip(pb, 1);
|
457 |
/* Force parsing as several audio frames can be in
|
458 |
* one packet. */
|
459 |
st->need_parsing = 1;
|
460 |
/* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
|
461 |
if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
|
462 |
st->need_parsing = 0;
|
463 |
/* AVI files with Xan DPCM audio (wrongly) declare PCM
|
464 |
* audio in the header but have Axan as stream_code_tag. */
|
465 |
if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){ |
466 |
st->codec->codec_id = CODEC_ID_XAN_DPCM; |
467 |
st->codec->codec_tag = 0;
|
468 |
} |
469 |
break;
|
470 |
default:
|
471 |
st->codec->codec_type = CODEC_TYPE_DATA; |
472 |
st->codec->codec_id= CODEC_ID_NONE; |
473 |
st->codec->codec_tag= 0;
|
474 |
url_fskip(pb, size); |
475 |
break;
|
476 |
} |
477 |
} |
478 |
break;
|
479 |
case MKTAG('i', 'n', 'd', 'x'): |
480 |
i= url_ftell(pb); |
481 |
if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
|
482 |
read_braindead_odml_indx(s, 0);
|
483 |
} |
484 |
url_fseek(pb, i+size, SEEK_SET); |
485 |
break;
|
486 |
case MKTAG('I', 'N', 'A', 'M'): |
487 |
avi_read_tag(pb, s->title, sizeof(s->title), size);
|
488 |
break;
|
489 |
case MKTAG('I', 'A', 'R', 'T'): |
490 |
avi_read_tag(pb, s->author, sizeof(s->author), size);
|
491 |
break;
|
492 |
case MKTAG('I', 'C', 'O', 'P'): |
493 |
avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
|
494 |
break;
|
495 |
case MKTAG('I', 'C', 'M', 'T'): |
496 |
avi_read_tag(pb, s->comment, sizeof(s->comment), size);
|
497 |
break;
|
498 |
case MKTAG('I', 'G', 'N', 'R'): |
499 |
avi_read_tag(pb, s->genre, sizeof(s->genre), size);
|
500 |
break;
|
501 |
case MKTAG('I', 'P', 'R', 'D'): |
502 |
avi_read_tag(pb, s->album, sizeof(s->album), size);
|
503 |
break;
|
504 |
case MKTAG('I', 'P', 'R', 'T'): |
505 |
avi_read_tag(pb, str_track, sizeof(str_track), size);
|
506 |
sscanf(str_track, "%d", &s->track);
|
507 |
break;
|
508 |
default:
|
509 |
/* skip tag */
|
510 |
size += (size & 1);
|
511 |
url_fskip(pb, size); |
512 |
break;
|
513 |
} |
514 |
} |
515 |
end_of_header:
|
516 |
/* check stream number */
|
517 |
if (stream_index != s->nb_streams - 1) { |
518 |
fail:
|
519 |
for(i=0;i<s->nb_streams;i++) { |
520 |
av_freep(&s->streams[i]->codec->extradata); |
521 |
av_freep(&s->streams[i]); |
522 |
} |
523 |
return -1; |
524 |
} |
525 |
|
526 |
if(!avi->index_loaded && !url_is_streamed(pb))
|
527 |
avi_load_index(s); |
528 |
avi->index_loaded = 1;
|
529 |
avi->non_interleaved |= guess_ni_flag(s); |
530 |
if(avi->non_interleaved)
|
531 |
clean_index(s); |
532 |
|
533 |
return 0; |
534 |
} |
535 |
|
536 |
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) |
537 |
{ |
538 |
AVIContext *avi = s->priv_data; |
539 |
ByteIOContext *pb = &s->pb; |
540 |
int n, d[8], size; |
541 |
offset_t i, sync; |
542 |
void* dstr;
|
543 |
|
544 |
if (ENABLE_DV_DEMUXER && avi->dv_demux) {
|
545 |
size = dv_get_packet(avi->dv_demux, pkt); |
546 |
if (size >= 0) |
547 |
return size;
|
548 |
} |
549 |
|
550 |
if(avi->non_interleaved){
|
551 |
int best_stream_index = 0; |
552 |
AVStream *best_st= NULL;
|
553 |
AVIStream *best_ast; |
554 |
int64_t best_ts= INT64_MAX; |
555 |
int i;
|
556 |
|
557 |
for(i=0; i<s->nb_streams; i++){ |
558 |
AVStream *st = s->streams[i]; |
559 |
AVIStream *ast = st->priv_data; |
560 |
int64_t ts= ast->frame_offset; |
561 |
|
562 |
if(ast->sample_size)
|
563 |
ts /= ast->sample_size; |
564 |
ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den); |
565 |
|
566 |
// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
|
567 |
if(ts < best_ts){
|
568 |
best_ts= ts; |
569 |
best_st= st; |
570 |
best_stream_index= i; |
571 |
} |
572 |
} |
573 |
best_ast = best_st->priv_data; |
574 |
best_ts= av_rescale(best_ts, best_st->time_base.den, AV_TIME_BASE * (int64_t)best_st->time_base.num); //FIXME a little ugly
|
575 |
if(best_ast->remaining)
|
576 |
i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD); |
577 |
else
|
578 |
i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY); |
579 |
|
580 |
// av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
|
581 |
if(i>=0){ |
582 |
int64_t pos= best_st->index_entries[i].pos; |
583 |
pos += best_ast->packet_size - best_ast->remaining; |
584 |
url_fseek(&s->pb, pos + 8, SEEK_SET);
|
585 |
// av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
|
586 |
|
587 |
assert(best_ast->remaining <= best_ast->packet_size); |
588 |
|
589 |
avi->stream_index= best_stream_index; |
590 |
if(!best_ast->remaining)
|
591 |
best_ast->packet_size= |
592 |
best_ast->remaining= best_st->index_entries[i].size; |
593 |
} |
594 |
} |
595 |
|
596 |
resync:
|
597 |
if(avi->stream_index >= 0){ |
598 |
AVStream *st= s->streams[ avi->stream_index ]; |
599 |
AVIStream *ast= st->priv_data; |
600 |
int size;
|
601 |
|
602 |
if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM |
603 |
size= INT_MAX; |
604 |
else if(ast->sample_size < 32) |
605 |
size= 64*ast->sample_size;
|
606 |
else
|
607 |
size= ast->sample_size; |
608 |
|
609 |
if(size > ast->remaining)
|
610 |
size= ast->remaining; |
611 |
av_get_packet(pb, pkt, size); |
612 |
|
613 |
if (ENABLE_DV_DEMUXER && avi->dv_demux) {
|
614 |
dstr = pkt->destruct; |
615 |
size = dv_produce_packet(avi->dv_demux, pkt, |
616 |
pkt->data, pkt->size); |
617 |
pkt->destruct = dstr; |
618 |
pkt->flags |= PKT_FLAG_KEY; |
619 |
} else {
|
620 |
/* XXX: how to handle B frames in avi ? */
|
621 |
pkt->dts = ast->frame_offset; |
622 |
// pkt->dts += ast->start;
|
623 |
if(ast->sample_size)
|
624 |
pkt->dts /= ast->sample_size; |
625 |
//av_log(NULL, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, avi->stream_index, size);
|
626 |
pkt->stream_index = avi->stream_index; |
627 |
|
628 |
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
|
629 |
AVIndexEntry *e; |
630 |
int index;
|
631 |
assert(st->index_entries); |
632 |
|
633 |
index= av_index_search_timestamp(st, pkt->dts, 0);
|
634 |
e= &st->index_entries[index]; |
635 |
|
636 |
if(index >= 0 && e->timestamp == ast->frame_offset){ |
637 |
if (e->flags & AVINDEX_KEYFRAME)
|
638 |
pkt->flags |= PKT_FLAG_KEY; |
639 |
} |
640 |
} else {
|
641 |
pkt->flags |= PKT_FLAG_KEY; |
642 |
} |
643 |
if(ast->sample_size)
|
644 |
ast->frame_offset += pkt->size; |
645 |
else
|
646 |
ast->frame_offset++; |
647 |
} |
648 |
ast->remaining -= size; |
649 |
if(!ast->remaining){
|
650 |
avi->stream_index= -1;
|
651 |
ast->packet_size= 0;
|
652 |
} |
653 |
|
654 |
return size;
|
655 |
} |
656 |
|
657 |
memset(d, -1, sizeof(int)*8); |
658 |
for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
|
659 |
int j;
|
660 |
|
661 |
if (i >= avi->movi_end) {
|
662 |
if (avi->is_odml) {
|
663 |
url_fskip(pb, avi->riff_end - i); |
664 |
avi->riff_end = avi->movi_end = url_fsize(pb); |
665 |
} else
|
666 |
break;
|
667 |
} |
668 |
|
669 |
for(j=0; j<7; j++) |
670 |
d[j]= d[j+1];
|
671 |
d[7]= get_byte(pb);
|
672 |
|
673 |
size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24); |
674 |
|
675 |
if( d[2] >= '0' && d[2] <= '9' |
676 |
&& d[3] >= '0' && d[3] <= '9'){ |
677 |
n= (d[2] - '0') * 10 + (d[3] - '0'); |
678 |
}else{
|
679 |
n= 100; //invalid stream id |
680 |
} |
681 |
//av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
|
682 |
if(i + size > avi->movi_end || d[0]<0) |
683 |
continue;
|
684 |
|
685 |
//parse ix##
|
686 |
if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) |
687 |
//parse JUNK
|
688 |
||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){ |
689 |
url_fskip(pb, size); |
690 |
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
|
691 |
goto resync;
|
692 |
} |
693 |
|
694 |
if( d[0] >= '0' && d[0] <= '9' |
695 |
&& d[1] >= '0' && d[1] <= '9'){ |
696 |
n= (d[0] - '0') * 10 + (d[1] - '0'); |
697 |
}else{
|
698 |
n= 100; //invalid stream id |
699 |
} |
700 |
|
701 |
//parse ##dc/##wb
|
702 |
if(n < s->nb_streams){
|
703 |
AVStream *st; |
704 |
AVIStream *ast; |
705 |
st = s->streams[n]; |
706 |
ast = st->priv_data; |
707 |
|
708 |
if( (st->discard >= AVDISCARD_DEFAULT && size==0) |
709 |
/*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering |
710 |
|| st->discard >= AVDISCARD_ALL){ |
711 |
if(ast->sample_size) ast->frame_offset += pkt->size;
|
712 |
else ast->frame_offset++;
|
713 |
url_fskip(pb, size); |
714 |
goto resync;
|
715 |
} |
716 |
|
717 |
if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) || |
718 |
d[2]*256+d[3] == ast->prefix /*|| |
719 |
(d[2] == 'd' && d[3] == 'c') ||
|
720 |
(d[2] == 'w' && d[3] == 'b')*/) {
|
721 |
|
722 |
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
|
723 |
if(d[2]*256+d[3] == ast->prefix) |
724 |
ast->prefix_count++; |
725 |
else{
|
726 |
ast->prefix= d[2]*256+d[3]; |
727 |
ast->prefix_count= 0;
|
728 |
} |
729 |
|
730 |
avi->stream_index= n; |
731 |
ast->packet_size= size + 8;
|
732 |
ast->remaining= size; |
733 |
|
734 |
{ |
735 |
uint64_t pos= url_ftell(pb) - 8;
|
736 |
if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){ |
737 |
av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME); |
738 |
} |
739 |
} |
740 |
goto resync;
|
741 |
} |
742 |
} |
743 |
/* palette changed chunk */
|
744 |
if ( d[0] >= '0' && d[0] <= '9' |
745 |
&& d[1] >= '0' && d[1] <= '9' |
746 |
&& ((d[2] == 'p' && d[3] == 'c')) |
747 |
&& n < s->nb_streams && i + size <= avi->movi_end) { |
748 |
|
749 |
AVStream *st; |
750 |
int first, clr, flags, k, p;
|
751 |
|
752 |
st = s->streams[n]; |
753 |
|
754 |
first = get_byte(pb); |
755 |
clr = get_byte(pb); |
756 |
if(!clr) /* all 256 colors used */ |
757 |
clr = 256;
|
758 |
flags = get_le16(pb); |
759 |
p = 4;
|
760 |
for (k = first; k < clr + first; k++) {
|
761 |
int r, g, b;
|
762 |
r = get_byte(pb); |
763 |
g = get_byte(pb); |
764 |
b = get_byte(pb); |
765 |
get_byte(pb); |
766 |
st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16); |
767 |
} |
768 |
st->codec->palctrl->palette_changed = 1;
|
769 |
goto resync;
|
770 |
} |
771 |
|
772 |
} |
773 |
|
774 |
return -1; |
775 |
} |
776 |
|
777 |
/* XXX: we make the implicit supposition that the position are sorted
|
778 |
for each stream */
|
779 |
static int avi_read_idx1(AVFormatContext *s, int size) |
780 |
{ |
781 |
AVIContext *avi = s->priv_data; |
782 |
ByteIOContext *pb = &s->pb; |
783 |
int nb_index_entries, i;
|
784 |
AVStream *st; |
785 |
AVIStream *ast; |
786 |
unsigned int index, tag, flags, pos, len; |
787 |
unsigned last_pos= -1; |
788 |
|
789 |
nb_index_entries = size / 16;
|
790 |
if (nb_index_entries <= 0) |
791 |
return -1; |
792 |
|
793 |
/* read the entries and sort them in each stream component */
|
794 |
for(i = 0; i < nb_index_entries; i++) { |
795 |
tag = get_le32(pb); |
796 |
flags = get_le32(pb); |
797 |
pos = get_le32(pb); |
798 |
len = get_le32(pb); |
799 |
#if defined(DEBUG_SEEK)
|
800 |
av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/", |
801 |
i, tag, flags, pos, len); |
802 |
#endif
|
803 |
if(i==0 && pos > avi->movi_list) |
804 |
avi->movi_list= 0; //FIXME better check |
805 |
pos += avi->movi_list; |
806 |
|
807 |
index = ((tag & 0xff) - '0') * 10; |
808 |
index += ((tag >> 8) & 0xff) - '0'; |
809 |
if (index >= s->nb_streams)
|
810 |
continue;
|
811 |
st = s->streams[index]; |
812 |
ast = st->priv_data; |
813 |
|
814 |
#if defined(DEBUG_SEEK)
|
815 |
av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len); |
816 |
#endif
|
817 |
if(last_pos == pos)
|
818 |
avi->non_interleaved= 1;
|
819 |
else
|
820 |
av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0); |
821 |
if(ast->sample_size)
|
822 |
ast->cum_len += len; |
823 |
else
|
824 |
ast->cum_len ++; |
825 |
last_pos= pos; |
826 |
} |
827 |
return 0; |
828 |
} |
829 |
|
830 |
static int guess_ni_flag(AVFormatContext *s){ |
831 |
int i;
|
832 |
int64_t last_start=0;
|
833 |
int64_t first_end= INT64_MAX; |
834 |
|
835 |
for(i=0; i<s->nb_streams; i++){ |
836 |
AVStream *st = s->streams[i]; |
837 |
int n= st->nb_index_entries;
|
838 |
|
839 |
if(n <= 0) |
840 |
continue;
|
841 |
|
842 |
if(st->index_entries[0].pos > last_start) |
843 |
last_start= st->index_entries[0].pos;
|
844 |
if(st->index_entries[n-1].pos < first_end) |
845 |
first_end= st->index_entries[n-1].pos;
|
846 |
} |
847 |
return last_start > first_end;
|
848 |
} |
849 |
|
850 |
static int avi_load_index(AVFormatContext *s) |
851 |
{ |
852 |
AVIContext *avi = s->priv_data; |
853 |
ByteIOContext *pb = &s->pb; |
854 |
uint32_t tag, size; |
855 |
offset_t pos= url_ftell(pb); |
856 |
|
857 |
url_fseek(pb, avi->movi_end, SEEK_SET); |
858 |
#ifdef DEBUG_SEEK
|
859 |
printf("movi_end=0x%"PRIx64"\n", avi->movi_end); |
860 |
#endif
|
861 |
for(;;) {
|
862 |
if (url_feof(pb))
|
863 |
break;
|
864 |
tag = get_le32(pb); |
865 |
size = get_le32(pb); |
866 |
#ifdef DEBUG_SEEK
|
867 |
printf("tag=%c%c%c%c size=0x%x\n",
|
868 |
tag & 0xff,
|
869 |
(tag >> 8) & 0xff, |
870 |
(tag >> 16) & 0xff, |
871 |
(tag >> 24) & 0xff, |
872 |
size); |
873 |
#endif
|
874 |
switch(tag) {
|
875 |
case MKTAG('i', 'd', 'x', '1'): |
876 |
if (avi_read_idx1(s, size) < 0) |
877 |
goto skip;
|
878 |
else
|
879 |
goto the_end;
|
880 |
break;
|
881 |
default:
|
882 |
skip:
|
883 |
size += (size & 1);
|
884 |
url_fskip(pb, size); |
885 |
break;
|
886 |
} |
887 |
} |
888 |
the_end:
|
889 |
url_fseek(pb, pos, SEEK_SET); |
890 |
return 0; |
891 |
} |
892 |
|
893 |
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
894 |
{ |
895 |
AVIContext *avi = s->priv_data; |
896 |
AVStream *st; |
897 |
int i, index;
|
898 |
int64_t pos; |
899 |
|
900 |
if (!avi->index_loaded) {
|
901 |
/* we only load the index on demand */
|
902 |
avi_load_index(s); |
903 |
avi->index_loaded = 1;
|
904 |
} |
905 |
assert(stream_index>= 0);
|
906 |
|
907 |
st = s->streams[stream_index]; |
908 |
index= av_index_search_timestamp(st, timestamp, flags); |
909 |
if(index<0) |
910 |
return -1; |
911 |
|
912 |
/* find the position */
|
913 |
pos = st->index_entries[index].pos; |
914 |
timestamp = st->index_entries[index].timestamp; |
915 |
|
916 |
// av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
|
917 |
|
918 |
if (ENABLE_DV_DEMUXER && avi->dv_demux) {
|
919 |
/* One and only one real stream for DV in AVI, and it has video */
|
920 |
/* offsets. Calling with other stream indices should have failed */
|
921 |
/* the av_index_search_timestamp call above. */
|
922 |
assert(stream_index == 0);
|
923 |
|
924 |
/* Feed the DV video stream version of the timestamp to the */
|
925 |
/* DV demux so it can synth correct timestamps */
|
926 |
dv_offset_reset(avi->dv_demux, timestamp); |
927 |
|
928 |
url_fseek(&s->pb, pos, SEEK_SET); |
929 |
avi->stream_index= -1;
|
930 |
return 0; |
931 |
} |
932 |
|
933 |
for(i = 0; i < s->nb_streams; i++) { |
934 |
AVStream *st2 = s->streams[i]; |
935 |
AVIStream *ast2 = st2->priv_data; |
936 |
|
937 |
ast2->packet_size= |
938 |
ast2->remaining= 0;
|
939 |
|
940 |
if (st2->nb_index_entries <= 0) |
941 |
continue;
|
942 |
|
943 |
// assert(st2->codec->block_align);
|
944 |
assert(st2->time_base.den == ast2->rate); |
945 |
assert(st2->time_base.num == ast2->scale); |
946 |
index = av_index_search_timestamp( |
947 |
st2, |
948 |
av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num), |
949 |
flags | AVSEEK_FLAG_BACKWARD); |
950 |
if(index<0) |
951 |
index=0;
|
952 |
|
953 |
if(!avi->non_interleaved){
|
954 |
while(index>0 && st2->index_entries[index].pos > pos) |
955 |
index--; |
956 |
while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos) |
957 |
index++; |
958 |
} |
959 |
|
960 |
// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
|
961 |
/* extract the current frame number */
|
962 |
ast2->frame_offset = st2->index_entries[index].timestamp; |
963 |
if(ast2->sample_size)
|
964 |
ast2->frame_offset *=ast2->sample_size; |
965 |
} |
966 |
|
967 |
/* do the seek */
|
968 |
url_fseek(&s->pb, pos, SEEK_SET); |
969 |
avi->stream_index= -1;
|
970 |
return 0; |
971 |
} |
972 |
|
973 |
static int avi_read_close(AVFormatContext *s) |
974 |
{ |
975 |
int i;
|
976 |
AVIContext *avi = s->priv_data; |
977 |
|
978 |
for(i=0;i<s->nb_streams;i++) { |
979 |
AVStream *st = s->streams[i]; |
980 |
AVIStream *ast = st->priv_data; |
981 |
av_free(ast); |
982 |
av_free(st->codec->palctrl); |
983 |
} |
984 |
|
985 |
if (avi->dv_demux)
|
986 |
av_free(avi->dv_demux); |
987 |
|
988 |
return 0; |
989 |
} |
990 |
|
991 |
static int avi_probe(AVProbeData *p) |
992 |
{ |
993 |
/* check file header */
|
994 |
if (p->buf_size <= 32) |
995 |
return 0; |
996 |
if (p->buf[0] == 'R' && p->buf[1] == 'I' && |
997 |
p->buf[2] == 'F' && p->buf[3] == 'F' && |
998 |
p->buf[8] == 'A' && p->buf[9] == 'V' && |
999 |
p->buf[10] == 'I' && p->buf[11] == ' ') |
1000 |
return AVPROBE_SCORE_MAX;
|
1001 |
else
|
1002 |
return 0; |
1003 |
} |
1004 |
|
1005 |
AVInputFormat avi_demuxer = { |
1006 |
"avi",
|
1007 |
"avi format",
|
1008 |
sizeof(AVIContext),
|
1009 |
avi_probe, |
1010 |
avi_read_header, |
1011 |
avi_read_packet, |
1012 |
avi_read_close, |
1013 |
avi_read_seek, |
1014 |
}; |