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FFmpeg/libavformat/westwood_vqa.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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/*
* Westwood Studios VQA Format 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
* Westwood Studios VQA file demuxer
* by Mike Melanson (melanson@pcisys.net)
* for more information on the Westwood file formats, visit:
* http://www.pcisys.net/~melanson/codecs/
* http://www.geocities.com/SiliconValley/8682/aud3.txt
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
#define FORM_TAG MKBETAG('F', 'O', 'R', 'M')
#define WVQA_TAG MKBETAG('W', 'V', 'Q', 'A')
#define VQHD_TAG MKBETAG('V', 'Q', 'H', 'D')
#define FINF_TAG MKBETAG('F', 'I', 'N', 'F')
#define SND0_TAG MKBETAG('S', 'N', 'D', '0')
#define SND1_TAG MKBETAG('S', 'N', 'D', '1')
#define SND2_TAG MKBETAG('S', 'N', 'D', '2')
#define VQFR_TAG MKBETAG('V', 'Q', 'F', 'R')
/* don't know what these tags are for, but acknowledge their existence */
#define CINF_TAG MKBETAG('C', 'I', 'N', 'F')
#define CINH_TAG MKBETAG('C', 'I', 'N', 'H')
#define CIND_TAG MKBETAG('C', 'I', 'N', 'D')
#define PINF_TAG MKBETAG('P', 'I', 'N', 'F')
#define PINH_TAG MKBETAG('P', 'I', 'N', 'H')
#define PIND_TAG MKBETAG('P', 'I', 'N', 'D')
#define CMDS_TAG MKBETAG('C', 'M', 'D', 'S')
#define VQA_HEADER_SIZE 0x2A
#define VQA_PREAMBLE_SIZE 8
typedef struct WsVqaDemuxContext {
int version;
int bps;
int channels;
int sample_rate;
int audio_stream_index;
int video_stream_index;
} WsVqaDemuxContext;
static int wsvqa_probe(const AVProbeData *p)
{
/* need 12 bytes to qualify */
if (p->buf_size < 12)
return 0;
/* check for the VQA signatures */
if ((AV_RB32(&p->buf[0]) != FORM_TAG) ||
(AV_RB32(&p->buf[8]) != WVQA_TAG))
return 0;
return AVPROBE_SCORE_MAX;
}
static int wsvqa_read_header(AVFormatContext *s)
{
WsVqaDemuxContext *wsvqa = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st;
uint8_t *header;
uint8_t scratch[VQA_PREAMBLE_SIZE];
uint32_t chunk_tag;
uint32_t chunk_size;
int fps, ret;
/* initialize the video decoder stream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->start_time = 0;
wsvqa->video_stream_index = st->index;
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_WS_VQA;
st->codecpar->codec_tag = 0; /* no fourcc */
/* skip to the start of the VQA header */
avio_seek(pb, 20, SEEK_SET);
/* the VQA header needs to go to the decoder */
if ((ret = ff_get_extradata(s, st->codecpar, pb, VQA_HEADER_SIZE)) < 0)
return ret;
header = st->codecpar->extradata;
st->codecpar->width = AV_RL16(&header[6]);
st->codecpar->height = AV_RL16(&header[8]);
fps = header[12];
st->nb_frames =
st->duration = AV_RL16(&header[4]);
if (fps < 1 || fps > 30) {
av_log(s, AV_LOG_ERROR, "invalid fps: %d\n", fps);
return AVERROR_INVALIDDATA;
}
avpriv_set_pts_info(st, 64, 1, fps);
wsvqa->version = AV_RL16(&header[ 0]);
wsvqa->sample_rate = AV_RL16(&header[24]);
wsvqa->channels = header[26];
wsvqa->bps = header[27];
wsvqa->audio_stream_index = -1;
s->ctx_flags |= AVFMTCTX_NOHEADER;
/* there are 0 or more chunks before the FINF chunk; iterate until
* FINF has been skipped and the file will be ready to be demuxed */
do {
if (avio_read(pb, scratch, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE)
return AVERROR(EIO);
chunk_tag = AV_RB32(&scratch[0]);
chunk_size = AV_RB32(&scratch[4]);
/* catch any unknown header tags, for curiosity */
switch (chunk_tag) {
case CINF_TAG:
case CINH_TAG:
case CIND_TAG:
case PINF_TAG:
case PINH_TAG:
case PIND_TAG:
case FINF_TAG:
case CMDS_TAG:
break;
default:
av_log(s, AV_LOG_ERROR, " note: unknown chunk seen (%s)\n",
av_fourcc2str(chunk_tag));
break;
}
avio_skip(pb, chunk_size);
} while (chunk_tag != FINF_TAG);
return 0;
}
static int wsvqa_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
WsVqaDemuxContext *wsvqa = s->priv_data;
AVIOContext *pb = s->pb;
int ret = -1;
uint8_t preamble[VQA_PREAMBLE_SIZE];
uint32_t chunk_type;
uint32_t chunk_size;
int skip_byte;
while (avio_read(pb, preamble, VQA_PREAMBLE_SIZE) == VQA_PREAMBLE_SIZE) {
chunk_type = AV_RB32(&preamble[0]);
chunk_size = AV_RB32(&preamble[4]);
skip_byte = chunk_size & 0x01;
if ((chunk_type == SND0_TAG) || (chunk_type == SND1_TAG) ||
(chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) {
ret= av_get_packet(pb, pkt, chunk_size);
if (ret<0)
return AVERROR(EIO);
switch (chunk_type) {
case SND0_TAG:
case SND1_TAG:
case SND2_TAG:
if (wsvqa->audio_stream_index == -1) {
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
wsvqa->audio_stream_index = st->index;
if (!wsvqa->sample_rate)
wsvqa->sample_rate = 22050;
if (!wsvqa->channels)
wsvqa->channels = 1;
if (!wsvqa->bps)
wsvqa->bps = 8;
st->codecpar->sample_rate = wsvqa->sample_rate;
st->codecpar->bits_per_coded_sample = wsvqa->bps;
st->codecpar->channels = wsvqa->channels;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
switch (chunk_type) {
case SND0_TAG:
if (wsvqa->bps == 16)
st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
else
st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
break;
case SND1_TAG:
st->codecpar->codec_id = AV_CODEC_ID_WESTWOOD_SND1;
break;
case SND2_TAG:
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WS;
if ((ret = ff_alloc_extradata(st->codecpar, 2)) < 0)
return ret;
AV_WL16(st->codecpar->extradata, wsvqa->version);
break;
}
}
pkt->stream_index = wsvqa->audio_stream_index;
switch (chunk_type) {
case SND1_TAG:
/* unpacked size is stored in header */
if(pkt->data)
pkt->duration = AV_RL16(pkt->data) / wsvqa->channels;
break;
case SND2_TAG:
/* 2 samples/byte, 1 or 2 samples per frame depending on stereo */
pkt->duration = (chunk_size * 2) / wsvqa->channels;
break;
}
break;
case VQFR_TAG:
pkt->stream_index = wsvqa->video_stream_index;
pkt->duration = 1;
break;
}
/* stay on 16-bit alignment */
if (skip_byte)
avio_skip(pb, 1);
return ret;
} else {
switch(chunk_type){
case CMDS_TAG:
break;
default:
av_log(s, AV_LOG_INFO, "Skipping unknown chunk %s\n",
av_fourcc2str(av_bswap32(chunk_type)));
}
avio_skip(pb, chunk_size + skip_byte);
}
}
return ret;
}
AVInputFormat ff_wsvqa_demuxer = {
.name = "wsvqa",
.long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA"),
.priv_data_size = sizeof(WsVqaDemuxContext),
.read_probe = wsvqa_probe,
.read_header = wsvqa_read_header,
.read_packet = wsvqa_read_packet,
};
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