123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336 |
- /*
- * Sega FILM Format (CPK) Demuxer
- * Copyright (c) 2003 The ffmpeg Project
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- /**
- * @file
- * Sega FILM (.cpk) file demuxer
- * by Mike Melanson (melanson@pcisys.net)
- * For more information regarding the Sega FILM file format, visit:
- * http://www.pcisys.net/~melanson/codecs/
- */
- #include "libavutil/intreadwrite.h"
- #include "avformat.h"
- #include "internal.h"
- #include "avio_internal.h"
- #define FILM_TAG MKBETAG('F', 'I', 'L', 'M')
- #define FDSC_TAG MKBETAG('F', 'D', 'S', 'C')
- #define STAB_TAG MKBETAG('S', 'T', 'A', 'B')
- #define CVID_TAG MKBETAG('c', 'v', 'i', 'd')
- #define RAW_TAG MKBETAG('r', 'a', 'w', ' ')
- typedef struct {
- int stream;
- int64_t sample_offset;
- unsigned int sample_size;
- int64_t pts;
- int keyframe;
- } film_sample;
- typedef struct FilmDemuxContext {
- int video_stream_index;
- int audio_stream_index;
- enum AVCodecID audio_type;
- unsigned int audio_samplerate;
- unsigned int audio_bits;
- unsigned int audio_channels;
- enum AVCodecID video_type;
- unsigned int sample_count;
- film_sample *sample_table;
- unsigned int current_sample;
- unsigned int base_clock;
- unsigned int version;
- /* buffer used for interleaving stereo PCM data */
- unsigned char *stereo_buffer;
- int stereo_buffer_size;
- } FilmDemuxContext;
- static int film_probe(AVProbeData *p)
- {
- if (AV_RB32(&p->buf[0]) != FILM_TAG)
- return 0;
- return AVPROBE_SCORE_MAX;
- }
- static int film_read_header(AVFormatContext *s)
- {
- FilmDemuxContext *film = s->priv_data;
- AVIOContext *pb = s->pb;
- AVStream *st;
- unsigned char scratch[256];
- int i;
- unsigned int data_offset;
- unsigned int audio_frame_counter;
- film->sample_table = NULL;
- film->stereo_buffer = NULL;
- film->stereo_buffer_size = 0;
- /* load the main FILM header */
- if (avio_read(pb, scratch, 16) != 16)
- return AVERROR(EIO);
- data_offset = AV_RB32(&scratch[4]);
- film->version = AV_RB32(&scratch[8]);
- /* load the FDSC chunk */
- if (film->version == 0) {
- /* special case for Lemmings .film files; 20-byte header */
- if (avio_read(pb, scratch, 20) != 20)
- return AVERROR(EIO);
- /* make some assumptions about the audio parameters */
- film->audio_type = AV_CODEC_ID_PCM_S8;
- film->audio_samplerate = 22050;
- film->audio_channels = 1;
- film->audio_bits = 8;
- } else {
- /* normal Saturn .cpk files; 32-byte header */
- if (avio_read(pb, scratch, 32) != 32)
- return AVERROR(EIO);
- film->audio_samplerate = AV_RB16(&scratch[24]);
- film->audio_channels = scratch[21];
- film->audio_bits = scratch[22];
- if (scratch[23] == 2)
- film->audio_type = AV_CODEC_ID_ADPCM_ADX;
- else if (film->audio_channels > 0) {
- if (film->audio_bits == 8)
- film->audio_type = AV_CODEC_ID_PCM_S8;
- else if (film->audio_bits == 16)
- film->audio_type = AV_CODEC_ID_PCM_S16BE;
- else
- film->audio_type = AV_CODEC_ID_NONE;
- } else
- film->audio_type = AV_CODEC_ID_NONE;
- }
- if (AV_RB32(&scratch[0]) != FDSC_TAG)
- return AVERROR_INVALIDDATA;
- if (AV_RB32(&scratch[8]) == CVID_TAG) {
- film->video_type = AV_CODEC_ID_CINEPAK;
- } else if (AV_RB32(&scratch[8]) == RAW_TAG) {
- film->video_type = AV_CODEC_ID_RAWVIDEO;
- } else {
- film->video_type = AV_CODEC_ID_NONE;
- }
- /* initialize the decoder streams */
- if (film->video_type) {
- st = avformat_new_stream(s, NULL);
- if (!st)
- return AVERROR(ENOMEM);
- film->video_stream_index = st->index;
- st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- st->codec->codec_id = film->video_type;
- st->codec->codec_tag = 0; /* no fourcc */
- st->codec->width = AV_RB32(&scratch[16]);
- st->codec->height = AV_RB32(&scratch[12]);
- if (film->video_type == AV_CODEC_ID_RAWVIDEO) {
- if (scratch[20] == 24) {
- st->codec->pix_fmt = PIX_FMT_RGB24;
- } else {
- av_log(s, AV_LOG_ERROR, "raw video is using unhandled %dbpp\n", scratch[20]);
- return -1;
- }
- }
- }
- if (film->audio_type) {
- st = avformat_new_stream(s, NULL);
- if (!st)
- return AVERROR(ENOMEM);
- film->audio_stream_index = st->index;
- st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- st->codec->codec_id = film->audio_type;
- st->codec->codec_tag = 1;
- st->codec->channels = film->audio_channels;
- st->codec->sample_rate = film->audio_samplerate;
- if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) {
- st->codec->bits_per_coded_sample = 18 * 8 / 32;
- st->codec->block_align = st->codec->channels * 18;
- st->need_parsing = AVSTREAM_PARSE_FULL;
- } else {
- st->codec->bits_per_coded_sample = film->audio_bits;
- st->codec->block_align = st->codec->channels *
- st->codec->bits_per_coded_sample / 8;
- }
- st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
- st->codec->bits_per_coded_sample;
- }
- /* load the sample table */
- if (avio_read(pb, scratch, 16) != 16)
- return AVERROR(EIO);
- if (AV_RB32(&scratch[0]) != STAB_TAG)
- return AVERROR_INVALIDDATA;
- film->base_clock = AV_RB32(&scratch[8]);
- film->sample_count = AV_RB32(&scratch[12]);
- if(film->sample_count >= UINT_MAX / sizeof(film_sample))
- return -1;
- film->sample_table = av_malloc(film->sample_count * sizeof(film_sample));
- if (!film->sample_table)
- return AVERROR(ENOMEM);
- for (i = 0; i < s->nb_streams; i++) {
- st = s->streams[i];
- if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
- avpriv_set_pts_info(st, 33, 1, film->base_clock);
- else
- avpriv_set_pts_info(st, 64, 1, film->audio_samplerate);
- }
- audio_frame_counter = 0;
- for (i = 0; i < film->sample_count; i++) {
- /* load the next sample record and transfer it to an internal struct */
- if (avio_read(pb, scratch, 16) != 16) {
- av_free(film->sample_table);
- return AVERROR(EIO);
- }
- film->sample_table[i].sample_offset =
- data_offset + AV_RB32(&scratch[0]);
- film->sample_table[i].sample_size = AV_RB32(&scratch[4]);
- if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) {
- film->sample_table[i].stream = film->audio_stream_index;
- film->sample_table[i].pts = audio_frame_counter;
- if (film->audio_type == AV_CODEC_ID_ADPCM_ADX)
- audio_frame_counter += (film->sample_table[i].sample_size * 32 /
- (18 * film->audio_channels));
- else if (film->audio_type != AV_CODEC_ID_NONE)
- audio_frame_counter += (film->sample_table[i].sample_size /
- (film->audio_channels * film->audio_bits / 8));
- } else {
- film->sample_table[i].stream = film->video_stream_index;
- film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF;
- film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1;
- }
- }
- film->current_sample = 0;
- return 0;
- }
- static int film_read_packet(AVFormatContext *s,
- AVPacket *pkt)
- {
- FilmDemuxContext *film = s->priv_data;
- AVIOContext *pb = s->pb;
- film_sample *sample;
- int ret = 0;
- int i;
- int left, right;
- if (film->current_sample >= film->sample_count)
- return AVERROR(EIO);
- sample = &film->sample_table[film->current_sample];
- /* position the stream (will probably be there anyway) */
- avio_seek(pb, sample->sample_offset, SEEK_SET);
- /* do a special song and dance when loading FILM Cinepak chunks */
- if ((sample->stream == film->video_stream_index) &&
- (film->video_type == AV_CODEC_ID_CINEPAK)) {
- pkt->pos= avio_tell(pb);
- if (av_new_packet(pkt, sample->sample_size))
- return AVERROR(ENOMEM);
- avio_read(pb, pkt->data, sample->sample_size);
- } else if ((sample->stream == film->audio_stream_index) &&
- (film->audio_channels == 2) &&
- (film->audio_type != AV_CODEC_ID_ADPCM_ADX)) {
- /* stereo PCM needs to be interleaved */
- if (ffio_limit(pb, sample->sample_size) != sample->sample_size)
- return AVERROR(EIO);
- if (av_new_packet(pkt, sample->sample_size))
- return AVERROR(ENOMEM);
- /* make sure the interleave buffer is large enough */
- if (sample->sample_size > film->stereo_buffer_size) {
- av_free(film->stereo_buffer);
- film->stereo_buffer_size = sample->sample_size;
- film->stereo_buffer = av_malloc(film->stereo_buffer_size);
- if (!film->stereo_buffer) {
- film->stereo_buffer_size = 0;
- return AVERROR(ENOMEM);
- }
- }
- pkt->pos= avio_tell(pb);
- ret = avio_read(pb, film->stereo_buffer, sample->sample_size);
- if (ret != sample->sample_size)
- ret = AVERROR(EIO);
- left = 0;
- right = sample->sample_size / 2;
- for (i = 0; i + 1 + 2*(film->audio_bits != 8) < sample->sample_size; ) {
- if (film->audio_bits == 8) {
- pkt->data[i++] = film->stereo_buffer[left++];
- pkt->data[i++] = film->stereo_buffer[right++];
- } else {
- pkt->data[i++] = film->stereo_buffer[left++];
- pkt->data[i++] = film->stereo_buffer[left++];
- pkt->data[i++] = film->stereo_buffer[right++];
- pkt->data[i++] = film->stereo_buffer[right++];
- }
- }
- } else {
- ret= av_get_packet(pb, pkt, sample->sample_size);
- if (ret != sample->sample_size)
- ret = AVERROR(EIO);
- }
- pkt->stream_index = sample->stream;
- pkt->pts = sample->pts;
- film->current_sample++;
- return ret;
- }
- static int film_read_close(AVFormatContext *s)
- {
- FilmDemuxContext *film = s->priv_data;
- av_free(film->sample_table);
- av_free(film->stereo_buffer);
- return 0;
- }
- AVInputFormat ff_segafilm_demuxer = {
- .name = "film_cpk",
- .long_name = NULL_IF_CONFIG_SMALL("Sega FILM / CPK"),
- .priv_data_size = sizeof(FilmDemuxContext),
- .read_probe = film_probe,
- .read_header = film_read_header,
- .read_packet = film_read_packet,
- .read_close = film_read_close,
- };
|