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FFmpeg/libavformat/bink.c
Andreas Rheinhardt c1e439d7e9 avformat: Forward errors where possible 
It is not uncommon to find code where the caller thinks to know better
what the return value should be than the callee. E.g. something like
"if (av_new_packet(pkt, size) < 0) return AVERROR(ENOMEM);". This commit
changes several instances of this to instead forward the actual error.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2019-12-12 19:25:33 +01:00

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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 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 *vst, *ast;
unsigned int i;
uint32_t pos, next_pos;
uint16_t flags;
int keyframe;
int ret;
uint32_t signature;
uint8_t revision;
vst = avformat_new_stream(s, NULL);
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++) {
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;
if (i == vst->duration - 1) {
next_pos = bink->file_size;
keyframe = 0;
} else {
next_pos = avio_rl32(pb);
keyframe = 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 (vst->index_entries)
avio_seek(pb, vst->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
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 = st->index_entries[index_entry].size;
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++;
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];
int64_t ret;
if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
return -1;
/* seek to the first frame */
ret = avio_seek(s->pb, vst->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;
}
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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