mirror of
https://github.com/librempeg/librempeg
synced 2024-11-23 03:28:27 +00:00
9f9f56e679
Keyframe detection was inverted in cfe1a9d311 in order to fix keyframe
flags set for the sample attached to trac #7091. However, that sample is
errantly muxed.
As noted at
https://web.archive.org/web/20020803104640/http://www.pcisys.net:80/~melanson/codecs/film-format.txt,
the original keyframe detection logic is correct, and this patch
restores it.
Signed-off-by: James Almer <jamrial@gmail.com>
343 lines
11 KiB
C
343 lines
11 KiB
C
/*
|
|
* 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;
|
|
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;
|
|
} FilmDemuxContext;
|
|
|
|
static int film_probe(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;
|
|
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) {
|
|
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;
|
|
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) {
|
|
st->codecpar->bits_per_coded_sample = 18 * 8 / 32;
|
|
st->codecpar->block_align = st->codecpar->channels * 18;
|
|
st->need_parsing = AVSTREAM_PARSE_FULL;
|
|
} else {
|
|
st->codecpar->bits_per_coded_sample = film->audio_bits;
|
|
st->codecpar->block_align = st->codecpar->channels *
|
|
st->codecpar->bits_per_coded_sample / 8;
|
|
}
|
|
|
|
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];
|
|
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,
|
|
};
|