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FFmpeg/libavformat/segafilm.c

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/*
* 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 film_sample {
int stream;
unsigned int sample_size;
int64_t sample_offset;
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;
} FilmDemuxContext;
static int film_probe(const AVProbeData *p)
{
if (AV_RB32(&p->buf[0]) != FILM_TAG)
return 0;
if (AV_RB32(&p->buf[16]) != FDSC_TAG)
return 0;
return AVPROBE_SCORE_MAX;
}
static int film_read_close(AVFormatContext *s)
{
FilmDemuxContext *film = s->priv_data;
av_freep(&film->sample_table);
return 0;
}
static int film_read_header(AVFormatContext *s)
{
FilmDemuxContext *film = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st;
unsigned char scratch[256];
int i, ret;
unsigned int data_offset;
unsigned int audio_frame_counter;
unsigned int video_frame_counter;
film->sample_table = NULL;
/* 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_channels > 0)
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_PLANAR;
else if (film->audio_bits == 16)
film->audio_type = AV_CODEC_ID_PCM_S16BE_PLANAR;
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;
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = film->video_type;
st->codecpar->codec_tag = 0; /* no fourcc */
st->codecpar->width = AV_RB32(&scratch[16]);
st->codecpar->height = AV_RB32(&scratch[12]);
if (film->video_type == AV_CODEC_ID_RAWVIDEO) {
if (scratch[20] == 24) {
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
st->codecpar->format = AV_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;
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = film->audio_type;
st->codecpar->codec_tag = 1;
st->codecpar->channels = film->audio_channels;
st->codecpar->sample_rate = film->audio_samplerate;
if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) {
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
st->codecpar->bits_per_coded_sample = 18 * 8 / 32;
st->codecpar->block_align = st->codecpar->channels * 18;
st->need_parsing = AVSTREAM_PARSE_FULL;
} else {
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
st->codecpar->bits_per_coded_sample = film->audio_bits;
st->codecpar->block_align = st->codecpar->channels *
st->codecpar->bits_per_coded_sample / 8;
}
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate *
st->codecpar->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_array(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];
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
if (st->codecpar->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 = video_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) {
ret = AVERROR(EIO);
goto fail;
}
film->sample_table[i].sample_offset =
data_offset + AV_RB32(&scratch[0]);
film->sample_table[i].sample_size = AV_RB32(&scratch[4]);
if (film->sample_table[i].sample_size > INT_MAX / 4) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
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 : AVINDEX_KEYFRAME;
video_frame_counter++;
if (film->video_type)
av_add_index_entry(s->streams[film->video_stream_index],
film->sample_table[i].sample_offset,
film->sample_table[i].pts,
film->sample_table[i].sample_size, 0,
film->sample_table[i].keyframe);
}
}
if (film->audio_type)
s->streams[film->audio_stream_index]->duration = audio_frame_counter;
if (film->video_type)
s->streams[film->video_stream_index]->duration = video_frame_counter;
film->current_sample = 0;
return 0;
fail:
film_read_close(s);
return ret;
}
static int film_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
FilmDemuxContext *film = s->priv_data;
AVIOContext *pb = s->pb;
film_sample *sample;
film_sample *next_sample = NULL;
int next_sample_id;
int ret = 0;
if (film->current_sample >= film->sample_count)
return AVERROR_EOF;
sample = &film->sample_table[film->current_sample];
/* Find the next sample from the same stream, assuming there is one;
* this is used to calculate the duration below */
next_sample_id = film->current_sample + 1;
while (next_sample == NULL) {
if (next_sample_id >= film->sample_count)
break;
next_sample = &film->sample_table[next_sample_id];
if (next_sample->stream != sample->stream) {
next_sample = NULL;
next_sample_id++;
}
}
/* position the stream (will probably be there anyway) */
avio_seek(pb, sample->sample_offset, SEEK_SET);
ret = av_get_packet(pb, pkt, sample->sample_size);
if (ret != sample->sample_size)
ret = AVERROR(EIO);
pkt->stream_index = sample->stream;
pkt->dts = sample->pts;
pkt->pts = sample->pts;
pkt->flags |= sample->keyframe ? AV_PKT_FLAG_KEY : 0;
if (next_sample != NULL)
pkt->duration = next_sample->pts - sample->pts;
film->current_sample++;
return ret;
}
static int film_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
FilmDemuxContext *film = s->priv_data;
AVStream *st = s->streams[stream_index];
int64_t pos;
int ret = av_index_search_timestamp(st, timestamp, flags);
if (ret < 0)
return ret;
pos = avio_seek(s->pb, st->index_entries[ret].pos, SEEK_SET);
if (pos < 0)
return pos;
film->current_sample = ret;
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,
.read_seek = film_read_seek,
};