ffmpeg / libavformat / iff.c @ 451b353d
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/*
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* IFF (.iff) file demuxer
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* Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
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* Copyright (c) 2010 Peter Ross <pross@xvid.org>
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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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/**
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* @file libavformat/iff.c
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* IFF file demuxer
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* by Jaikrishnan Menon
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* for more information on the .iff file format, visit:
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* http://wiki.multimedia.cx/index.php?title=IFF
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*/
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#define ID_8SVX MKTAG('8','S','V','X') |
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#define ID_VHDR MKTAG('V','H','D','R') |
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#define ID_ATAK MKTAG('A','T','A','K') |
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#define ID_RLSE MKTAG('R','L','S','E') |
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#define ID_CHAN MKTAG('C','H','A','N') |
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#define ID_PBM MKTAG('P','B','M',' ') |
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#define ID_ILBM MKTAG('I','L','B','M') |
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#define ID_BMHD MKTAG('B','M','H','D') |
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#define ID_CMAP MKTAG('C','M','A','P') |
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#define ID_FORM MKTAG('F','O','R','M') |
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#define ID_ANNO MKTAG('A','N','N','O') |
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#define ID_AUTH MKTAG('A','U','T','H') |
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#define ID_CHRS MKTAG('C','H','R','S') |
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#define ID_COPYRIGHT MKTAG('(','c',')',' ') |
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#define ID_CSET MKTAG('C','S','E','T') |
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#define ID_FVER MKTAG('F','V','E','R') |
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#define ID_NAME MKTAG('N','A','M','E') |
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#define ID_TEXT MKTAG('T','E','X','T') |
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#define ID_BODY MKTAG('B','O','D','Y') |
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#define LEFT 2 |
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#define RIGHT 4 |
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#define STEREO 6 |
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#define PACKET_SIZE 1024 |
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typedef enum {COMP_NONE, COMP_FIB, COMP_EXP} svx8_compression_type; |
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typedef enum {BITMAP_RAW, BITMAP_BYTERUN1} bitmap_compression_type; |
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typedef struct { |
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uint32_t body_size; |
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uint32_t sent_bytes; |
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uint32_t audio_frame_count; |
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} IffDemuxContext; |
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static void interleave_stereo(const uint8_t *src, uint8_t *dest, int size) |
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{ |
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uint8_t *end = dest + size; |
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size = size>>1;
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while(dest < end) {
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*dest++ = *src; |
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*dest++ = *(src+size); |
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src++; |
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} |
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} |
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static int iff_probe(AVProbeData *p) |
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{ |
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const uint8_t *d = p->buf;
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if ( AV_RL32(d) == ID_FORM &&
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(AV_RL32(d+8) == ID_8SVX || AV_RL32(d+8) == ID_PBM || AV_RL32(d+8) == ID_ILBM) ) |
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return AVPROBE_SCORE_MAX;
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return 0; |
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} |
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static int iff_read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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IffDemuxContext *iff = s->priv_data; |
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ByteIOContext *pb = s->pb; |
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AVStream *st; |
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uint32_t chunk_id, data_size; |
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int padding, done = 0; |
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int compression = -1; |
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->channels = 1;
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url_fskip(pb, 8);
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// codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
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st->codec->codec_tag = get_le32(pb); |
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while(!done && !url_feof(pb)) {
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chunk_id = get_le32(pb); |
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data_size = get_be32(pb); |
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padding = data_size & 1;
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switch(chunk_id) {
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case ID_VHDR:
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st->codec->codec_type = CODEC_TYPE_AUDIO; |
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url_fskip(pb, 12);
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st->codec->sample_rate = get_be16(pb); |
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url_fskip(pb, 1);
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compression = get_byte(pb); |
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url_fskip(pb, 4);
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break;
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case ID_BODY:
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iff->body_size = data_size; |
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done = 1;
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break;
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case ID_CHAN:
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st->codec->channels = (get_be32(pb) < 6) ? 1 : 2; |
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break;
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case ID_CMAP:
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st->codec->extradata_size = data_size; |
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st->codec->extradata = av_malloc(data_size); |
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if (!st->codec->extradata)
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return AVERROR(ENOMEM);
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if (get_buffer(pb, st->codec->extradata, data_size) < 0) |
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return AVERROR(EIO);
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break;
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case ID_BMHD:
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st->codec->codec_type = CODEC_TYPE_VIDEO; |
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st->codec->width = get_be16(pb); |
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st->codec->height = get_be16(pb); |
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url_fskip(pb, 4); // x, y offset |
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st->codec->bits_per_coded_sample = get_byte(pb); |
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url_fskip(pb, 1); // masking |
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compression = get_byte(pb); |
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url_fskip(pb, 3); // paddding, transparent |
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st->sample_aspect_ratio.num = get_byte(pb); |
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st->sample_aspect_ratio.den = get_byte(pb); |
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url_fskip(pb, 4); // source page width, height |
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break;
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default:
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url_fseek(pb, data_size + padding, SEEK_CUR); |
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break;
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} |
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} |
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switch(st->codec->codec_type) {
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case CODEC_TYPE_AUDIO:
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av_set_pts_info(st, 32, 1, st->codec->sample_rate); |
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switch(compression) {
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case COMP_NONE:
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st->codec->codec_id = CODEC_ID_PCM_S8; |
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break;
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case COMP_FIB:
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st->codec->codec_id = CODEC_ID_8SVX_FIB; |
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break;
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case COMP_EXP:
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st->codec->codec_id = CODEC_ID_8SVX_EXP; |
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break;
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default:
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av_log(s, AV_LOG_ERROR, "iff: unknown compression method\n");
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return -1; |
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} |
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st->codec->bits_per_coded_sample = 8;
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st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample; |
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st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample; |
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break;
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case CODEC_TYPE_VIDEO:
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switch (compression) {
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case BITMAP_RAW:
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if (st->codec->codec_tag == ID_ILBM) {
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st->codec->codec_id = CODEC_ID_IFF_ILBM; |
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} else {
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st->codec->codec_id = CODEC_ID_RAWVIDEO; |
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st->codec->pix_fmt = PIX_FMT_PAL8; |
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st->codec->codec_tag = 0;
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} |
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break;
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case BITMAP_BYTERUN1:
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st->codec->codec_id = CODEC_ID_IFF_BYTERUN1; |
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break;
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default:
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av_log(s, AV_LOG_ERROR, "unknown compression method\n");
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return AVERROR_INVALIDDATA;
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} |
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break;
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default:
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return -1; |
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} |
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return 0; |
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} |
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int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal);
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static int iff_read_packet(AVFormatContext *s, |
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AVPacket *pkt) |
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{ |
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IffDemuxContext *iff = s->priv_data; |
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ByteIOContext *pb = s->pb; |
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AVStream *st = s->streams[0];
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int ret;
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if(iff->sent_bytes >= iff->body_size)
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return AVERROR(EIO);
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if(s->streams[0]->codec->channels == 2) { |
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uint8_t sample_buffer[PACKET_SIZE]; |
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ret = get_buffer(pb, sample_buffer, PACKET_SIZE); |
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if(av_new_packet(pkt, PACKET_SIZE) < 0) { |
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av_log(s, AV_LOG_ERROR, "iff: cannot allocate packet \n");
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return AVERROR(ENOMEM);
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} |
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interleave_stereo(sample_buffer, pkt->data, PACKET_SIZE); |
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} else if (s->streams[0]->codec->codec_id == CODEC_ID_RAWVIDEO) { |
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if(av_new_packet(pkt, iff->body_size + AVPALETTE_SIZE) < 0) { |
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return AVERROR(ENOMEM);
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} |
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ret = ff_cmap_read_palette(st->codec, (uint32_t*)(pkt->data + iff->body_size)); |
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if (ret < 0) |
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return ret;
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av_freep(&st->codec->extradata); |
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st->codec->extradata_size = 0;
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ret = get_buffer(pb, pkt->data, iff->body_size); |
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} else if (s->streams[0]->codec->codec_type == CODEC_TYPE_VIDEO) { |
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ret = av_get_packet(pb, pkt, iff->body_size); |
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} else {
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ret = av_get_packet(pb, pkt, PACKET_SIZE); |
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} |
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if(iff->sent_bytes == 0) |
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pkt->flags |= PKT_FLAG_KEY; |
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if(s->streams[0]->codec->codec_type == CODEC_TYPE_AUDIO) { |
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iff->sent_bytes += PACKET_SIZE; |
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} else {
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iff->sent_bytes = iff->body_size; |
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} |
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pkt->stream_index = 0;
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if(s->streams[0]->codec->codec_type == CODEC_TYPE_AUDIO) { |
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pkt->pts = iff->audio_frame_count; |
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iff->audio_frame_count += ret / s->streams[0]->codec->channels;
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} |
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return ret;
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} |
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AVInputFormat iff_demuxer = { |
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"IFF",
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NULL_IF_CONFIG_SMALL("IFF format"),
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sizeof(IffDemuxContext),
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iff_probe, |
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iff_read_header, |
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iff_read_packet, |
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}; |