virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
Code Issues Releases Activity
61097535cd
FFmpeg/libavformat/vqf.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

298 lines
8.5 KiB
C
Raw Blame History

/*
* VQF demuxer
* Copyright (c) 2009 Vitor Sessak
*
* 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 "avformat.h"
#include "internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "libavutil/mathematics.h"
#include "riff.h"
typedef struct VqfContext {
int frame_bit_len;
uint8_t last_frame_bits;
int remaining_bits;
} VqfContext;
static int vqf_probe(const AVProbeData *probe_packet)
{
if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N'))
return 0;
if (!memcmp(probe_packet->buf + 4, "97012000", 8))
return AVPROBE_SCORE_MAX;
if (!memcmp(probe_packet->buf + 4, "00052200", 8))
return AVPROBE_SCORE_MAX;
if (AV_RL32(probe_packet->buf + 12) > (1<<27))
return AVPROBE_SCORE_EXTENSION/2;
return AVPROBE_SCORE_EXTENSION;
}
static void add_metadata(AVFormatContext *s, uint32_t tag,
unsigned int tag_len, unsigned int remaining)
{
int len = FFMIN(tag_len, remaining);
char *buf, key[5] = {0};
if (len == UINT_MAX)
return;
buf = av_malloc(len+1);
if (!buf)
return;
avio_read(s->pb, buf, len);
buf[len] = 0;
AV_WL32(key, tag);
av_dict_set(&s->metadata, key, buf, AV_DICT_DONT_STRDUP_VAL);
}
static const AVMetadataConv vqf_metadata_conv[] = {
{ "(c) ", "copyright" },
{ "ARNG", "arranger" },
{ "AUTH", "author" },
{ "BAND", "band" },
{ "CDCT", "conductor" },
{ "COMT", "comment" },
{ "FILE", "filename" },
{ "GENR", "genre" },
{ "LABL", "publisher" },
{ "MUSC", "composer" },
{ "NAME", "title" },
{ "NOTE", "note" },
{ "PROD", "producer" },
{ "PRSN", "personnel" },
{ "REMX", "remixer" },
{ "SING", "singer" },
{ "TRCK", "track" },
{ "WORD", "words" },
{ 0 },
};
static int vqf_read_header(AVFormatContext *s)
{
VqfContext *c = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
int chunk_tag;
int rate_flag = -1;
int header_size;
int read_bitrate = 0;
int size, ret;
uint8_t comm_chunk[12];
if (!st)
return AVERROR(ENOMEM);
avio_skip(s->pb, 12);
header_size = avio_rb32(s->pb);
if (header_size < 0)
return AVERROR_INVALIDDATA;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_TWINVQ;
st->start_time = 0;
do {
int len;
chunk_tag = avio_rl32(s->pb);
if (chunk_tag == MKTAG('D','A','T','A'))
break;
len = avio_rb32(s->pb);
if ((unsigned) len > INT_MAX/2 || header_size < 8) {
av_log(s, AV_LOG_ERROR, "Malformed header\n");
return -1;
}
header_size -= 8;
switch(chunk_tag){
case MKTAG('C','O','M','M'):
avio_read(s->pb, comm_chunk, 12);
st->codecpar->channels = AV_RB32(comm_chunk ) + 1;
read_bitrate = AV_RB32(comm_chunk + 4);
rate_flag = AV_RB32(comm_chunk + 8);
avio_skip(s->pb, len-12);
if (st->codecpar->channels <= 0) {
av_log(s, AV_LOG_ERROR, "Invalid number of channels\n");
return AVERROR_INVALIDDATA;
}
st->codecpar->bit_rate = (int64_t)read_bitrate * 1000;
break;
case MKTAG('D','S','I','Z'): // size of compressed data
{
av_dict_set_int(&s->metadata, "size", avio_rb32(s->pb), 0);
}
break;
case MKTAG('Y','E','A','R'): // recording date
case MKTAG('E','N','C','D'): // compression date
case MKTAG('E','X','T','R'): // reserved
case MKTAG('_','Y','M','H'): // reserved
case MKTAG('_','N','T','T'): // reserved
case MKTAG('_','I','D','3'): // reserved for ID3 tags
avio_skip(s->pb, FFMIN(len, header_size));
break;
default:
add_metadata(s, chunk_tag, len, header_size);
break;
}
header_size -= len;
} while (header_size >= 0 && !avio_feof(s->pb));
switch (rate_flag) {
case -1:
av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
return -1;
case 44:
st->codecpar->sample_rate = 44100;
break;
case 22:
st->codecpar->sample_rate = 22050;
break;
case 11:
st->codecpar->sample_rate = 11025;
break;
default:
if (rate_flag < 8 || rate_flag > 44) {
av_log(s, AV_LOG_ERROR, "Invalid rate flag %d\n", rate_flag);
return AVERROR_INVALIDDATA;
}
st->codecpar->sample_rate = rate_flag*1000;
break;
}
if (read_bitrate / st->codecpar->channels < 8 ||
read_bitrate / st->codecpar->channels > 48) {
av_log(s, AV_LOG_ERROR, "Invalid bitrate per channel %d\n",
read_bitrate / st->codecpar->channels);
return AVERROR_INVALIDDATA;
}
switch (((st->codecpar->sample_rate/1000) << 8) +
read_bitrate/st->codecpar->channels) {
case (11<<8) + 8 :
case (8 <<8) + 8 :
case (11<<8) + 10:
case (22<<8) + 32:
size = 512;
break;
case (16<<8) + 16:
case (22<<8) + 20:
case (22<<8) + 24:
size = 1024;
break;
case (44<<8) + 40:
case (44<<8) + 48:
size = 2048;
break;
default:
av_log(s, AV_LOG_ERROR, "Mode not supported: %d Hz, %"PRId64" kb/s.\n",
st->codecpar->sample_rate, st->codecpar->bit_rate);
return -1;
}
c->frame_bit_len = st->codecpar->bit_rate*size/st->codecpar->sample_rate;
avpriv_set_pts_info(st, 64, size, st->codecpar->sample_rate);
/* put first 12 bytes of COMM chunk in extradata */
if ((ret = ff_alloc_extradata(st->codecpar, 12)) < 0)
return ret;
memcpy(st->codecpar->extradata, comm_chunk, 12);
ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv);
return 0;
}
static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
VqfContext *c = s->priv_data;
int ret;
int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
if (av_new_packet(pkt, size+2) < 0)
return AVERROR(EIO);
pkt->pos = avio_tell(s->pb);
pkt->stream_index = 0;
pkt->duration = 1;
pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
pkt->data[1] = c->last_frame_bits;
ret = avio_read(s->pb, pkt->data+2, size);
if (ret != size) {
av_packet_unref(pkt);
return AVERROR(EIO);
}
c->last_frame_bits = pkt->data[size+1];
c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits;
return size+2;
}
static int vqf_read_seek(AVFormatContext *s,
int stream_index, int64_t timestamp, int flags)
{
VqfContext *c = s->priv_data;
AVStream *st;
int64_t ret;
int64_t pos;
st = s->streams[stream_index];
pos = av_rescale_rnd(timestamp * st->codecpar->bit_rate,
st->time_base.num,
st->time_base.den * (int64_t)c->frame_bit_len,
(flags & AVSEEK_FLAG_BACKWARD) ?
AV_ROUND_DOWN : AV_ROUND_UP);
pos *= c->frame_bit_len;
st->cur_dts = av_rescale(pos, st->time_base.den,
st->codecpar->bit_rate * (int64_t)st->time_base.num);
if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->internal->data_offset, SEEK_SET)) < 0)
return ret;
c->remaining_bits = -7 - ((pos-7)&7);
return 0;
}
AVInputFormat ff_vqf_demuxer = {
.name = "vqf",
.long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
.priv_data_size = sizeof(VqfContext),
.read_probe = vqf_probe,
.read_header = vqf_read_header,
.read_packet = vqf_read_packet,
.read_seek = vqf_read_seek,
.extensions = "vqf,vql,vqe",
};
Reference in New Issue View Git Blame Copy Permalink