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FFmpeg/libavformat/smush.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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/*
* LucasArts Smush demuxer
* Copyright (c) 2006 Cyril Zorin
*
* 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
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "avio.h"
#include "internal.h"
typedef struct SMUSHContext {
int version;
int audio_stream_index;
int video_stream_index;
} SMUSHContext;
static int smush_read_probe(const AVProbeData *p)
{
if (((AV_RL32(p->buf) == MKTAG('S', 'A', 'N', 'M') &&
AV_RL32(p->buf + 8) == MKTAG('S', 'H', 'D', 'R')) ||
(AV_RL32(p->buf) == MKTAG('A', 'N', 'I', 'M') &&
AV_RL32(p->buf + 8) == MKTAG('A', 'H', 'D', 'R')))) {
return AVPROBE_SCORE_MAX;
}
return 0;
}
static int smush_read_header(AVFormatContext *ctx)
{
SMUSHContext *smush = ctx->priv_data;
AVIOContext *pb = ctx->pb;
AVStream *vst, *ast;
uint32_t magic, nframes, size, subversion, i;
uint32_t width = 0, height = 0, got_audio = 0, read = 0;
uint32_t sample_rate, channels, palette[256];
int ret;
magic = avio_rb32(pb);
avio_skip(pb, 4); // skip movie size
if (magic == MKBETAG('A', 'N', 'I', 'M')) {
if (avio_rb32(pb) != MKBETAG('A', 'H', 'D', 'R'))
return AVERROR_INVALIDDATA;
size = avio_rb32(pb);
if (size < 3 * 256 + 6)
return AVERROR_INVALIDDATA;
smush->version = 0;
subversion = avio_rl16(pb);
nframes = avio_rl16(pb);
if (!nframes)
return AVERROR_INVALIDDATA;
avio_skip(pb, 2); // skip pad
for (i = 0; i < 256; i++)
palette[i] = avio_rb24(pb);
avio_skip(pb, size - (3 * 256 + 6));
} else if (magic == MKBETAG('S', 'A', 'N', 'M')) {
if (avio_rb32(pb) != MKBETAG('S', 'H', 'D', 'R'))
return AVERROR_INVALIDDATA;
size = avio_rb32(pb);
if (size < 14)
return AVERROR_INVALIDDATA;
smush->version = 1;
subversion = avio_rl16(pb);
nframes = avio_rl32(pb);
if (!nframes)
return AVERROR_INVALIDDATA;
avio_skip(pb, 2); // skip pad
width = avio_rl16(pb);
height = avio_rl16(pb);
avio_skip(pb, 2); // skip pad
avio_skip(pb, size - 14);
if (avio_rb32(pb) != MKBETAG('F', 'L', 'H', 'D'))
return AVERROR_INVALIDDATA;
size = avio_rb32(pb);
while (!got_audio && ((read + 8) < size)) {
uint32_t sig, chunk_size;
if (avio_feof(pb))
return AVERROR_EOF;
sig = avio_rb32(pb);
chunk_size = avio_rb32(pb);
read += 8;
switch (sig) {
case MKBETAG('W', 'a', 'v', 'e'):
got_audio = 1;
sample_rate = avio_rl32(pb);
if (!sample_rate)
return AVERROR_INVALIDDATA;
channels = avio_rl32(pb);
if (!channels)
return AVERROR_INVALIDDATA;
avio_skip(pb, chunk_size - 8);
read += chunk_size;
break;
case MKBETAG('B', 'l', '1', '6'):
case MKBETAG('A', 'N', 'N', 'O'):
avio_skip(pb, chunk_size);
read += chunk_size;
break;
default:
return AVERROR_INVALIDDATA;
}
}
avio_skip(pb, size - read);
} else {
av_log(ctx, AV_LOG_ERROR, "Wrong magic\n");
return AVERROR_INVALIDDATA;
}
vst = avformat_new_stream(ctx, 0);
if (!vst)
return AVERROR(ENOMEM);
smush->video_stream_index = vst->index;
avpriv_set_pts_info(vst, 64, 1, 15);
vst->start_time = 0;
vst->duration =
vst->nb_frames = nframes;
vst->avg_frame_rate = av_inv_q(vst->time_base);
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codecpar->codec_id = AV_CODEC_ID_SANM;
vst->codecpar->codec_tag = 0;
vst->codecpar->width = width;
vst->codecpar->height = height;
if (!smush->version) {
if ((ret = ff_alloc_extradata(vst->codecpar, 1024 + 2)) < 0)
return ret;
AV_WL16(vst->codecpar->extradata, subversion);
for (i = 0; i < 256; i++)
AV_WL32(vst->codecpar->extradata + 2 + i * 4, palette[i]);
}
if (got_audio) {
ast = avformat_new_stream(ctx, 0);
if (!ast)
return AVERROR(ENOMEM);
smush->audio_stream_index = ast->index;
ast->start_time = 0;
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codecpar->codec_id = AV_CODEC_ID_ADPCM_VIMA;
ast->codecpar->codec_tag = 0;
ast->codecpar->sample_rate = sample_rate;
ast->codecpar->channels = channels;
avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
}
return 0;
}
static int smush_read_packet(AVFormatContext *ctx, AVPacket *pkt)
{
SMUSHContext *smush = ctx->priv_data;
AVIOContext *pb = ctx->pb;
int done = 0;
int ret;
while (!done) {
uint32_t sig, size;
if (avio_feof(pb))
return AVERROR_EOF;
sig = avio_rb32(pb);
size = avio_rb32(pb);
switch (sig) {
case MKBETAG('F', 'R', 'M', 'E'):
if (smush->version)
break;
if ((ret = av_get_packet(pb, pkt, size)) < 0)
return ret;
pkt->stream_index = smush->video_stream_index;
done = 1;
break;
case MKBETAG('B', 'l', '1', '6'):
if ((ret = av_get_packet(pb, pkt, size)) < 0)
return ret;
pkt->stream_index = smush->video_stream_index;
pkt->duration = 1;
done = 1;
break;
case MKBETAG('W', 'a', 'v', 'e'):
if (size < 13)
return AVERROR_INVALIDDATA;
if (av_get_packet(pb, pkt, size) < 13)
return AVERROR(EIO);
pkt->stream_index = smush->audio_stream_index;
pkt->flags |= AV_PKT_FLAG_KEY;
pkt->duration = AV_RB32(pkt->data);
if (pkt->duration == 0xFFFFFFFFu)
pkt->duration = AV_RB32(pkt->data + 8);
done = 1;
break;
default:
avio_skip(pb, size);
break;
}
}
return 0;
}
AVInputFormat ff_smush_demuxer = {
.name = "smush",
.long_name = NULL_IF_CONFIG_SMALL("LucasArts Smush"),
.priv_data_size = sizeof(SMUSHContext),
.read_probe = smush_read_probe,
.read_header = smush_read_header,
.read_packet = smush_read_packet,
};
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