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FFmpeg/libavformat/bink.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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/*
* Bink demuxer
* Copyright (c) 2008-2010 Peter Ross (pross@xvid.org)
* Copyright (c) 2009 Daniel Verkamp (daniel@drv.nu)
*
* 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
* Bink demuxer
*
* Technical details here:
* http://wiki.multimedia.cx/index.php?title=Bink_Container
*/
#include <inttypes.h>
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
enum BinkAudFlags {
BINK_AUD_16BITS = 0x4000, ///< prefer 16-bit output
BINK_AUD_STEREO = 0x2000,
BINK_AUD_USEDCT = 0x1000,
};
#define BINK_EXTRADATA_SIZE 1
#define BINK_MAX_AUDIO_TRACKS 256
#define BINK_MAX_WIDTH 7680
#define BINK_MAX_HEIGHT 4800
#define SMUSH_BLOCK_SIZE 512
typedef struct BinkDemuxContext {
uint32_t file_size;
uint32_t num_audio_tracks;
int current_track; ///< audio track to return in next packet
int64_t video_pts;
int64_t audio_pts[BINK_MAX_AUDIO_TRACKS];
uint32_t remain_packet_size;
int flags;
int smush_size;
} BinkDemuxContext;
static int probe(const AVProbeData *p)
{
const uint8_t *b = p->buf;
int smush = AV_RN32(p->buf) == AV_RN32("SMUS");
do {
if (((b[0] == 'B' && b[1] == 'I' && b[2] == 'K' && /* Bink 1 */
(b[3] == 'b' || b[3] == 'f' || b[3] == 'g' || b[3] == 'h' || b[3] == 'i' ||
b[3] == 'k')) ||
(b[0] == 'K' && b[1] == 'B' && b[2] == '2' && /* Bink 2 */
(b[3] == 'a' || b[3] == 'd' || b[3] == 'f' || b[3] == 'g' || b[3] == 'h' ||
b[3] == 'i' || b[3] == 'j' || b[3] == 'k'))) &&
AV_RL32(b+8) > 0 && // num_frames
AV_RL32(b+20) > 0 && AV_RL32(b+20) <= BINK_MAX_WIDTH &&
AV_RL32(b+24) > 0 && AV_RL32(b+24) <= BINK_MAX_HEIGHT &&
AV_RL32(b+28) > 0 && AV_RL32(b+32) > 0) // fps num,den
return AVPROBE_SCORE_MAX;
b += SMUSH_BLOCK_SIZE;
} while (smush && b < p->buf + p->buf_size - 32);
return 0;
}
static int read_header(AVFormatContext *s)
{
BinkDemuxContext *bink = s->priv_data;
AVIOContext *pb = s->pb;
uint32_t fps_num, fps_den;
AVStream *const vst = avformat_new_stream(s, NULL);
FFStream *const vsti = ffstream(vst);
unsigned int i;
uint32_t pos, next_pos;
uint16_t flags;
int next_keyframe = 1;
int keyframe;
int ret;
uint32_t signature;
uint8_t revision;
if (!vst)
return AVERROR(ENOMEM);
vst->codecpar->codec_tag = avio_rl32(pb);
if (vst->codecpar->codec_tag == AV_RL32("SMUS")) {
do {
bink->smush_size += SMUSH_BLOCK_SIZE;
avio_skip(pb, SMUSH_BLOCK_SIZE - 4);
vst->codecpar->codec_tag = avio_rl32(pb);
} while (!avio_feof(pb) && (vst->codecpar->codec_tag & 0xFFFFFF) != AV_RL32("BIK"));
if (avio_feof(pb)) {
av_log(s, AV_LOG_ERROR, "invalid SMUSH header: BIK not found\n");
return AVERROR_INVALIDDATA;
}
}
bink->file_size = avio_rl32(pb) + 8;
vst->duration = avio_rl32(pb);
if (vst->duration > 1000000) {
av_log(s, AV_LOG_ERROR, "invalid header: more than 1000000 frames\n");
return AVERROR(EIO);
}
if (avio_rl32(pb) > bink->file_size) {
av_log(s, AV_LOG_ERROR,
"invalid header: largest frame size greater than file size\n");
return AVERROR(EIO);
}
avio_skip(pb, 4);
vst->codecpar->width = avio_rl32(pb);
vst->codecpar->height = avio_rl32(pb);
fps_num = avio_rl32(pb);
fps_den = avio_rl32(pb);
if (fps_num == 0 || fps_den == 0) {
av_log(s, AV_LOG_ERROR,
"invalid header: invalid fps (%"PRIu32"/%"PRIu32")\n",
fps_num, fps_den);
return AVERROR(EIO);
}
avpriv_set_pts_info(vst, 64, fps_den, fps_num);
vst->avg_frame_rate = av_inv_q(vst->time_base);
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codecpar->codec_id = AV_CODEC_ID_BINKVIDEO;
if ((vst->codecpar->codec_tag & 0xFFFFFF) == MKTAG('K', 'B', '2', 0)) {
av_log(s, AV_LOG_WARNING, "Bink 2 video is not implemented\n");
vst->codecpar->codec_id = AV_CODEC_ID_NONE;
}
if ((ret = ff_get_extradata(s, vst->codecpar, pb, 4)) < 0)
return ret;
bink->num_audio_tracks = avio_rl32(pb);
if (bink->num_audio_tracks > BINK_MAX_AUDIO_TRACKS) {
av_log(s, AV_LOG_ERROR,
"invalid header: more than "AV_STRINGIFY(BINK_MAX_AUDIO_TRACKS)" audio tracks (%"PRIu32")\n",
bink->num_audio_tracks);
return AVERROR(EIO);
}
signature = (vst->codecpar->codec_tag & 0xFFFFFF);
revision = ((vst->codecpar->codec_tag >> 24) % 0xFF);
if ((signature == AV_RL32("BIK") && (revision == 'k')) ||
(signature == AV_RL32("KB2") && (revision == 'i' || revision == 'j' || revision == 'k')))
avio_skip(pb, 4); /* unknown new field */
if (bink->num_audio_tracks) {
avio_skip(pb, 4 * bink->num_audio_tracks); /* max decoded size */
for (i = 0; i < bink->num_audio_tracks; i++) {
AVStream *const ast = avformat_new_stream(s, NULL);
if (!ast)
return AVERROR(ENOMEM);
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codecpar->codec_tag = 0;
ast->codecpar->sample_rate = avio_rl16(pb);
avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
flags = avio_rl16(pb);
ast->codecpar->codec_id = flags & BINK_AUD_USEDCT ?
AV_CODEC_ID_BINKAUDIO_DCT : AV_CODEC_ID_BINKAUDIO_RDFT;
if (flags & BINK_AUD_STEREO) {
ast->codecpar->channels = 2;
ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
} else {
ast->codecpar->channels = 1;
ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
}
if ((ret = ff_alloc_extradata(ast->codecpar, 4)) < 0)
return ret;
AV_WL32(ast->codecpar->extradata, vst->codecpar->codec_tag);
}
for (i = 0; i < bink->num_audio_tracks; i++)
s->streams[i + 1]->id = avio_rl32(pb);
}
/* frame index table */
next_pos = avio_rl32(pb);
for (i = 0; i < vst->duration; i++) {
pos = next_pos;
keyframe = next_keyframe;
if (i == vst->duration - 1) {
next_pos = bink->file_size;
next_keyframe = 0;
} else {
next_pos = avio_rl32(pb);
next_keyframe = next_pos & 1;
}
pos &= ~1;
next_pos &= ~1;
if (next_pos <= pos) {
av_log(s, AV_LOG_ERROR, "invalid frame index table\n");
return AVERROR(EIO);
}
if ((ret = av_add_index_entry(vst, pos, i, next_pos - pos, 0,
keyframe ? AVINDEX_KEYFRAME : 0)) < 0)
return ret;
}
if (vsti->index_entries)
avio_seek(pb, vsti->index_entries[0].pos + bink->smush_size, SEEK_SET);
else
avio_skip(pb, 4);
bink->current_track = -1;
return 0;
}
static int read_packet(AVFormatContext *s, AVPacket *pkt)
{
BinkDemuxContext *bink = s->priv_data;
AVIOContext *pb = s->pb;
int ret;
if (bink->current_track < 0) {
int index_entry;
AVStream *st = s->streams[0]; // stream 0 is video stream with index
FFStream *const sti = ffstream(st);
if (bink->video_pts >= st->duration)
return AVERROR_EOF;
index_entry = av_index_search_timestamp(st, bink->video_pts,
AVSEEK_FLAG_ANY);
if (index_entry < 0) {
av_log(s, AV_LOG_ERROR,
"could not find index entry for frame %"PRId64"\n",
bink->video_pts);
return AVERROR(EIO);
}
bink->remain_packet_size = sti->index_entries[index_entry].size;
bink->flags = sti->index_entries[index_entry].flags;
bink->current_track = 0;
}
while (bink->current_track < bink->num_audio_tracks) {
uint32_t audio_size = avio_rl32(pb);
if (audio_size > bink->remain_packet_size - 4) {
av_log(s, AV_LOG_ERROR,
"frame %"PRId64": audio size in header (%"PRIu32") > size of packet left (%"PRIu32")\n",
bink->video_pts, audio_size, bink->remain_packet_size);
return AVERROR(EIO);
}
bink->remain_packet_size -= 4 + audio_size;
bink->current_track++;
if (audio_size >= 4) {
/* get one audio packet per track */
if ((ret = av_get_packet(pb, pkt, audio_size)) < 0)
return ret;
pkt->stream_index = bink->current_track;
pkt->pts = bink->audio_pts[bink->current_track - 1];
/* Each audio packet reports the number of decompressed samples
(in bytes). We use this value to calculate the audio PTS */
if (pkt->size >= 4)
bink->audio_pts[bink->current_track -1] +=
AV_RL32(pkt->data) / (2 * s->streams[bink->current_track]->codecpar->channels);
return 0;
} else {
avio_skip(pb, audio_size);
}
}
/* get video packet */
if ((ret = av_get_packet(pb, pkt, bink->remain_packet_size)) < 0)
return ret;
pkt->stream_index = 0;
pkt->pts = bink->video_pts++;
if (bink->flags & AVINDEX_KEYFRAME)
pkt->flags |= AV_PKT_FLAG_KEY;
/* -1 instructs the next call to read_packet() to read the next frame */
bink->current_track = -1;
return 0;
}
static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
BinkDemuxContext *bink = s->priv_data;
AVStream *vst = s->streams[0];
FFStream *const vsti = ffstream(vst);
int64_t ret;
if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
return -1;
/* seek to the first frame */
ret = avio_seek(s->pb, vsti->index_entries[0].pos + bink->smush_size, SEEK_SET);
if (ret < 0)
return ret;
bink->video_pts = 0;
memset(bink->audio_pts, 0, sizeof(bink->audio_pts));
bink->current_track = -1;
return 0;
}
const AVInputFormat ff_bink_demuxer = {
.name = "bink",
.long_name = NULL_IF_CONFIG_SMALL("Bink"),
.priv_data_size = sizeof(BinkDemuxContext),
.read_probe = probe,
.read_header = read_header,
.read_packet = read_packet,
.read_seek = read_seek,
.flags = AVFMT_SHOW_IDS,
};
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