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57adb26d05
FFmpeg/libavformat/segafilm.c
Andreas Rheinhardt 40bdd8cc05 avformat: Avoid allocation for AVStreamInternal 
Do this by allocating AVStream together with the data that is
currently in AVStreamInternal; or rather: Put AVStream at the
beginning of a new structure called FFStream (which encompasses
more than just the internal fields and is a proper context in its own
right, hence the name) and remove AVStreamInternal altogether.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-09-17 13:22:25 +02:00

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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;
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;
}
if (film->video_type == AV_CODEC_ID_NONE && film->audio_type == AV_CODEC_ID_NONE)
return AVERROR_INVALIDDATA;
/* initialize the decoder streams */
if (film->video_type != AV_CODEC_ID_NONE) {
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 != AV_CODEC_ID_NONE) {
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;
ffstream(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]);
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)
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 (film->sample_table[i].sample_size > INT_MAX / 4)
return AVERROR_INVALIDDATA;
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_CODEC_ID_NONE)
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 != AV_CODEC_ID_NONE)
s->streams[film->audio_stream_index]->duration = audio_frame_counter;
if (film->video_type != AV_CODEC_ID_NONE)
s->streams[film->video_stream_index]->duration = video_frame_counter;
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;
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, ffstream(st)->index_entries[ret].pos, SEEK_SET);
if (pos < 0)
return pos;
film->current_sample = ret;
return 0;
}
const AVInputFormat ff_segafilm_demuxer = {
.name = "film_cpk",
.long_name = NULL_IF_CONFIG_SMALL("Sega FILM / CPK"),
.priv_data_size = sizeof(FilmDemuxContext),
.flags_internal = FF_FMT_INIT_CLEANUP,
.read_probe = film_probe,
.read_header = film_read_header,
.read_packet = film_read_packet,
.read_close = film_read_close,
.read_seek = film_read_seek,
};
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