ffmpeg / libavformat / segafilm.c @ 5509bffa
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/*
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* Sega FILM Format (CPK) Demuxer
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* Copyright (c) 2003 The ffmpeg Project
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; 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 segafilm.c
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* Sega FILM (.cpk) file demuxer
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* by Mike Melanson (melanson@pcisys.net)
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* For more information regarding the Sega FILM file format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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*/
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#include "avformat.h" |
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#define FILM_TAG MKBETAG('F', 'I', 'L', 'M') |
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#define FDSC_TAG MKBETAG('F', 'D', 'S', 'C') |
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#define STAB_TAG MKBETAG('S', 'T', 'A', 'B') |
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#define CVID_TAG MKBETAG('c', 'v', 'i', 'd') |
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typedef struct { |
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int stream;
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offset_t sample_offset; |
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unsigned int sample_size; |
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int64_t pts; |
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int keyframe;
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} film_sample_t; |
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typedef struct FilmDemuxContext { |
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int video_stream_index;
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int audio_stream_index;
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unsigned int audio_type; |
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unsigned int audio_samplerate; |
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unsigned int audio_bits; |
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unsigned int audio_channels; |
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unsigned int video_type; |
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unsigned int sample_count; |
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film_sample_t *sample_table; |
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unsigned int current_sample; |
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unsigned int base_clock; |
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unsigned int version; |
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int cvid_extra_bytes; /* the number of bytes thrown into the Cinepak |
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* chunk header to throw off decoders */
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/* buffer used for interleaving stereo PCM data */
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unsigned char *stereo_buffer; |
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int stereo_buffer_size;
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} FilmDemuxContext; |
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static int film_probe(AVProbeData *p) |
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{ |
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if (p->buf_size < 4) |
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return 0; |
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if (BE_32(&p->buf[0]) != FILM_TAG) |
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return 0; |
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return AVPROBE_SCORE_MAX;
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} |
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static int film_read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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FilmDemuxContext *film = (FilmDemuxContext *)s->priv_data; |
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ByteIOContext *pb = &s->pb; |
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AVStream *st; |
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unsigned char scratch[256]; |
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int i;
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unsigned int data_offset; |
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unsigned int audio_frame_counter; |
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film->sample_table = NULL;
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film->stereo_buffer = NULL;
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film->stereo_buffer_size = 0;
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/* load the main FILM header */
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if (get_buffer(pb, scratch, 16) != 16) |
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return AVERROR_IO;
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data_offset = BE_32(&scratch[4]);
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film->version = BE_32(&scratch[8]);
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/* load the FDSC chunk */
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if (film->version == 0) { |
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/* special case for Lemmings .film files; 20-byte header */
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if (get_buffer(pb, scratch, 20) != 20) |
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return AVERROR_IO;
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/* make some assumptions about the audio parameters */
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film->audio_type = CODEC_ID_PCM_S8; |
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film->audio_samplerate = 22050;
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film->audio_channels = 1;
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film->audio_bits = 8;
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} else {
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/* normal Saturn .cpk files; 32-byte header */
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if (get_buffer(pb, scratch, 32) != 32) |
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return AVERROR_IO;
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film->audio_samplerate = BE_16(&scratch[24]);;
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film->audio_channels = scratch[21];
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film->audio_bits = scratch[22];
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if (film->audio_bits == 8) |
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film->audio_type = CODEC_ID_PCM_S8; |
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else if (film->audio_bits == 16) |
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film->audio_type = CODEC_ID_PCM_S16BE; |
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else
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film->audio_type = 0;
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} |
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if (BE_32(&scratch[0]) != FDSC_TAG) |
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return AVERROR_INVALIDDATA;
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film->cvid_extra_bytes = 0;
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if (BE_32(&scratch[8]) == CVID_TAG) { |
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film->video_type = CODEC_ID_CINEPAK; |
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if (film->version)
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film->cvid_extra_bytes = 2;
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else
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film->cvid_extra_bytes = 6; /* Lemmings 3DO case */ |
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} else
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film->video_type = 0;
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/* initialize the decoder streams */
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if (film->video_type) {
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR_NOMEM;
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film->video_stream_index = st->index; |
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st->codec->codec_type = CODEC_TYPE_VIDEO; |
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st->codec->codec_id = film->video_type; |
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st->codec->codec_tag = 0; /* no fourcc */ |
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st->codec->width = BE_32(&scratch[16]);
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st->codec->height = BE_32(&scratch[12]);
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} |
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if (film->audio_type) {
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR_NOMEM;
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film->audio_stream_index = st->index; |
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st->codec->codec_type = CODEC_TYPE_AUDIO; |
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st->codec->codec_id = film->audio_type; |
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st->codec->codec_tag = 1;
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st->codec->channels = film->audio_channels; |
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st->codec->bits_per_sample = film->audio_bits; |
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st->codec->sample_rate = film->audio_samplerate; |
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st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * |
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st->codec->bits_per_sample; |
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st->codec->block_align = st->codec->channels * |
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st->codec->bits_per_sample / 8;
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} |
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/* load the sample table */
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if (get_buffer(pb, scratch, 16) != 16) |
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return AVERROR_IO;
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if (BE_32(&scratch[0]) != STAB_TAG) |
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return AVERROR_INVALIDDATA;
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film->base_clock = BE_32(&scratch[8]);
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film->sample_count = BE_32(&scratch[12]);
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if(film->sample_count >= UINT_MAX / sizeof(film_sample_t)) |
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return -1; |
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film->sample_table = av_malloc(film->sample_count * sizeof(film_sample_t));
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for(i=0; i<s->nb_streams; i++) |
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av_set_pts_info(s->streams[i], 33, 1, film->base_clock); |
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audio_frame_counter = 0;
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for (i = 0; i < film->sample_count; i++) { |
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/* load the next sample record and transfer it to an internal struct */
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if (get_buffer(pb, scratch, 16) != 16) { |
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av_free(film->sample_table); |
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return AVERROR_IO;
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} |
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film->sample_table[i].sample_offset = |
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data_offset + BE_32(&scratch[0]);
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film->sample_table[i].sample_size = BE_32(&scratch[4]);
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if (BE_32(&scratch[8]) == 0xFFFFFFFF) { |
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film->sample_table[i].stream = film->audio_stream_index; |
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film->sample_table[i].pts = audio_frame_counter; |
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film->sample_table[i].pts *= film->base_clock; |
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film->sample_table[i].pts /= film->audio_samplerate; |
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audio_frame_counter += (film->sample_table[i].sample_size / |
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(film->audio_channels * film->audio_bits / 8));
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} else {
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film->sample_table[i].stream = film->video_stream_index; |
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film->sample_table[i].pts = BE_32(&scratch[8]) & 0x7FFFFFFF; |
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film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1; |
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} |
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} |
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film->current_sample = 0;
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return 0; |
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} |
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static int film_read_packet(AVFormatContext *s, |
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AVPacket *pkt) |
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{ |
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FilmDemuxContext *film = (FilmDemuxContext *)s->priv_data; |
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ByteIOContext *pb = &s->pb; |
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film_sample_t *sample; |
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int ret = 0; |
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int i;
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int left, right;
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if (film->current_sample >= film->sample_count)
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return AVERROR_IO;
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sample = &film->sample_table[film->current_sample]; |
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/* position the stream (will probably be there anyway) */
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url_fseek(pb, sample->sample_offset, SEEK_SET); |
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/* do a special song and dance when loading FILM Cinepak chunks */
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if ((sample->stream == film->video_stream_index) &&
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(film->video_type == CODEC_ID_CINEPAK)) { |
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if (av_new_packet(pkt, sample->sample_size - film->cvid_extra_bytes))
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return AVERROR_NOMEM;
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if(pkt->size < 10) |
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return -1; |
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pkt->pos= url_ftell(pb); |
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ret = get_buffer(pb, pkt->data, 10);
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/* skip the non-spec CVID bytes */
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url_fseek(pb, film->cvid_extra_bytes, SEEK_CUR); |
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ret += get_buffer(pb, pkt->data + 10,
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sample->sample_size - 10 - film->cvid_extra_bytes);
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if (ret != sample->sample_size - film->cvid_extra_bytes)
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ret = AVERROR_IO; |
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} else if ((sample->stream == film->audio_stream_index) && |
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(film->audio_channels == 2)) {
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/* stereo PCM needs to be interleaved */
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if (av_new_packet(pkt, sample->sample_size))
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return AVERROR_NOMEM;
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/* make sure the interleave buffer is large enough */
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if (sample->sample_size > film->stereo_buffer_size) {
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av_free(film->stereo_buffer); |
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film->stereo_buffer_size = sample->sample_size; |
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film->stereo_buffer = av_malloc(film->stereo_buffer_size); |
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} |
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pkt->pos= url_ftell(pb); |
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ret = get_buffer(pb, film->stereo_buffer, sample->sample_size); |
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if (ret != sample->sample_size)
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ret = AVERROR_IO; |
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left = 0;
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right = sample->sample_size / 2;
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for (i = 0; i < sample->sample_size; ) { |
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if (film->audio_bits == 8) { |
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pkt->data[i++] = film->stereo_buffer[left++]; |
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pkt->data[i++] = film->stereo_buffer[right++]; |
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} else {
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pkt->data[i++] = film->stereo_buffer[left++]; |
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pkt->data[i++] = film->stereo_buffer[left++]; |
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pkt->data[i++] = film->stereo_buffer[right++]; |
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pkt->data[i++] = film->stereo_buffer[right++]; |
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} |
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} |
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} else {
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ret= av_get_packet(pb, pkt, sample->sample_size); |
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if (ret != sample->sample_size)
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ret = AVERROR_IO; |
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} |
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pkt->stream_index = sample->stream; |
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pkt->pts = sample->pts; |
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film->current_sample++; |
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return ret;
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} |
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static int film_read_close(AVFormatContext *s) |
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{ |
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FilmDemuxContext *film = (FilmDemuxContext *)s->priv_data; |
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av_free(film->sample_table); |
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av_free(film->stereo_buffer); |
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return 0; |
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} |
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static AVInputFormat film_iformat = {
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"film_cpk",
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"Sega FILM/CPK format",
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sizeof(FilmDemuxContext),
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film_probe, |
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film_read_header, |
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film_read_packet, |
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film_read_close, |
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}; |
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int film_init(void) |
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{ |
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av_register_input_format(&film_iformat); |
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return 0; |
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} |