mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-21 08:45:06 +02:00
![Diego Biurrun](/assets/img/avatar_default.png)
Passing an explicit filename to this command is only necessary if the documentation in the @file block refers to a file different from the one the block resides in. Originally committed as revision 22921 to svn://svn.ffmpeg.org/ffmpeg/trunk
389 lines
13 KiB
C
389 lines
13 KiB
C
/*
|
|
* Westwood Studios Multimedia Formats Demuxer (VQA, AUD)
|
|
* 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 & AUD file demuxers
|
|
* 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
|
|
*
|
|
* Implementation note: There is no definite file signature for AUD files.
|
|
* The demuxer uses a probabilistic strategy for content detection. This
|
|
* entails performing sanity checks on certain header values in order to
|
|
* qualify a file. Refer to wsaud_probe() for the precise parameters.
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avformat.h"
|
|
|
|
#define AUD_HEADER_SIZE 12
|
|
#define AUD_CHUNK_PREAMBLE_SIZE 8
|
|
#define AUD_CHUNK_SIGNATURE 0x0000DEAF
|
|
|
|
#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_FRAMERATE 15
|
|
#define VQA_PREAMBLE_SIZE 8
|
|
|
|
typedef struct WsAudDemuxContext {
|
|
int audio_samplerate;
|
|
int audio_channels;
|
|
int audio_bits;
|
|
enum CodecID audio_type;
|
|
int audio_stream_index;
|
|
int64_t audio_frame_counter;
|
|
} WsAudDemuxContext;
|
|
|
|
typedef struct WsVqaDemuxContext {
|
|
int audio_samplerate;
|
|
int audio_channels;
|
|
int audio_bits;
|
|
|
|
int audio_stream_index;
|
|
int video_stream_index;
|
|
|
|
int64_t audio_frame_counter;
|
|
} WsVqaDemuxContext;
|
|
|
|
static int wsaud_probe(AVProbeData *p)
|
|
{
|
|
int field;
|
|
|
|
/* Probabilistic content detection strategy: There is no file signature
|
|
* so perform sanity checks on various header parameters:
|
|
* 8000 <= sample rate (16 bits) <= 48000 ==> 40001 acceptable numbers
|
|
* flags <= 0x03 (2 LSBs are used) ==> 4 acceptable numbers
|
|
* compression type (8 bits) = 1 or 99 ==> 2 acceptable numbers
|
|
* first audio chunk signature (32 bits) ==> 1 acceptable number
|
|
* The number space contains 2^64 numbers. There are 40001 * 4 * 2 * 1 =
|
|
* 320008 acceptable number combinations.
|
|
*/
|
|
|
|
if (p->buf_size < AUD_HEADER_SIZE + AUD_CHUNK_PREAMBLE_SIZE)
|
|
return 0;
|
|
|
|
/* check sample rate */
|
|
field = AV_RL16(&p->buf[0]);
|
|
if ((field < 8000) || (field > 48000))
|
|
return 0;
|
|
|
|
/* enforce the rule that the top 6 bits of this flags field are reserved (0);
|
|
* this might not be true, but enforce it until deemed unnecessary */
|
|
if (p->buf[10] & 0xFC)
|
|
return 0;
|
|
|
|
/* note: only check for WS IMA (type 99) right now since there is no
|
|
* support for type 1 */
|
|
if (p->buf[11] != 99)
|
|
return 0;
|
|
|
|
/* read ahead to the first audio chunk and validate the first header signature */
|
|
if (AV_RL32(&p->buf[16]) != AUD_CHUNK_SIGNATURE)
|
|
return 0;
|
|
|
|
/* return 1/2 certainty since this file check is a little sketchy */
|
|
return AVPROBE_SCORE_MAX / 2;
|
|
}
|
|
|
|
static int wsaud_read_header(AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
WsAudDemuxContext *wsaud = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
AVStream *st;
|
|
unsigned char header[AUD_HEADER_SIZE];
|
|
|
|
if (get_buffer(pb, header, AUD_HEADER_SIZE) != AUD_HEADER_SIZE)
|
|
return AVERROR(EIO);
|
|
wsaud->audio_samplerate = AV_RL16(&header[0]);
|
|
if (header[11] == 99)
|
|
wsaud->audio_type = CODEC_ID_ADPCM_IMA_WS;
|
|
else
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
/* flag 0 indicates stereo */
|
|
wsaud->audio_channels = (header[10] & 0x1) + 1;
|
|
/* flag 1 indicates 16 bit audio */
|
|
wsaud->audio_bits = (((header[10] & 0x2) >> 1) + 1) * 8;
|
|
|
|
/* initialize the audio decoder stream */
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
av_set_pts_info(st, 33, 1, wsaud->audio_samplerate);
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codec->codec_id = wsaud->audio_type;
|
|
st->codec->codec_tag = 0; /* no tag */
|
|
st->codec->channels = wsaud->audio_channels;
|
|
st->codec->sample_rate = wsaud->audio_samplerate;
|
|
st->codec->bits_per_coded_sample = wsaud->audio_bits;
|
|
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
|
|
st->codec->bits_per_coded_sample / 4;
|
|
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
|
|
|
|
wsaud->audio_stream_index = st->index;
|
|
wsaud->audio_frame_counter = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wsaud_read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
WsAudDemuxContext *wsaud = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
unsigned char preamble[AUD_CHUNK_PREAMBLE_SIZE];
|
|
unsigned int chunk_size;
|
|
int ret = 0;
|
|
|
|
if (get_buffer(pb, preamble, AUD_CHUNK_PREAMBLE_SIZE) !=
|
|
AUD_CHUNK_PREAMBLE_SIZE)
|
|
return AVERROR(EIO);
|
|
|
|
/* validate the chunk */
|
|
if (AV_RL32(&preamble[4]) != AUD_CHUNK_SIGNATURE)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
chunk_size = AV_RL16(&preamble[0]);
|
|
ret= av_get_packet(pb, pkt, chunk_size);
|
|
if (ret != chunk_size)
|
|
return AVERROR(EIO);
|
|
pkt->stream_index = wsaud->audio_stream_index;
|
|
pkt->pts = wsaud->audio_frame_counter;
|
|
pkt->pts /= wsaud->audio_samplerate;
|
|
|
|
/* 2 samples/byte, 1 or 2 samples per frame depending on stereo */
|
|
wsaud->audio_frame_counter += (chunk_size * 2) / wsaud->audio_channels;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int wsvqa_probe(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,
|
|
AVFormatParameters *ap)
|
|
{
|
|
WsVqaDemuxContext *wsvqa = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
AVStream *st;
|
|
unsigned char *header;
|
|
unsigned char scratch[VQA_PREAMBLE_SIZE];
|
|
unsigned int chunk_tag;
|
|
unsigned int chunk_size;
|
|
|
|
/* initialize the video decoder stream */
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
av_set_pts_info(st, 33, 1, VQA_FRAMERATE);
|
|
wsvqa->video_stream_index = st->index;
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_id = CODEC_ID_WS_VQA;
|
|
st->codec->codec_tag = 0; /* no fourcc */
|
|
|
|
/* skip to the start of the VQA header */
|
|
url_fseek(pb, 20, SEEK_SET);
|
|
|
|
/* the VQA header needs to go to the decoder */
|
|
st->codec->extradata_size = VQA_HEADER_SIZE;
|
|
st->codec->extradata = av_mallocz(VQA_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
header = (unsigned char *)st->codec->extradata;
|
|
if (get_buffer(pb, st->codec->extradata, VQA_HEADER_SIZE) !=
|
|
VQA_HEADER_SIZE) {
|
|
av_free(st->codec->extradata);
|
|
return AVERROR(EIO);
|
|
}
|
|
st->codec->width = AV_RL16(&header[6]);
|
|
st->codec->height = AV_RL16(&header[8]);
|
|
|
|
/* initialize the audio decoder stream for VQA v1 or nonzero samplerate */
|
|
if (AV_RL16(&header[24]) || (AV_RL16(&header[0]) == 1 && AV_RL16(&header[2]) == 1)) {
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
av_set_pts_info(st, 33, 1, VQA_FRAMERATE);
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
if (AV_RL16(&header[0]) == 1)
|
|
st->codec->codec_id = CODEC_ID_WESTWOOD_SND1;
|
|
else
|
|
st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS;
|
|
st->codec->codec_tag = 0; /* no tag */
|
|
st->codec->sample_rate = AV_RL16(&header[24]);
|
|
if (!st->codec->sample_rate)
|
|
st->codec->sample_rate = 22050;
|
|
st->codec->channels = header[26];
|
|
if (!st->codec->channels)
|
|
st->codec->channels = 1;
|
|
st->codec->bits_per_coded_sample = 16;
|
|
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
|
|
st->codec->bits_per_coded_sample / 4;
|
|
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
|
|
|
|
wsvqa->audio_stream_index = st->index;
|
|
wsvqa->audio_samplerate = st->codec->sample_rate;
|
|
wsvqa->audio_channels = st->codec->channels;
|
|
wsvqa->audio_frame_counter = 0;
|
|
}
|
|
|
|
/* 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 (get_buffer(pb, scratch, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE) {
|
|
av_free(st->codec->extradata);
|
|
return AVERROR(EIO);
|
|
}
|
|
chunk_tag = AV_RB32(&scratch[0]);
|
|
chunk_size = AV_RB32(&scratch[4]);
|
|
|
|
/* catch any unknown header tags, for curiousity */
|
|
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 (%c%c%c%c)\n",
|
|
scratch[0], scratch[1],
|
|
scratch[2], scratch[3]);
|
|
break;
|
|
}
|
|
|
|
url_fseek(pb, chunk_size, SEEK_CUR);
|
|
} while (chunk_tag != FINF_TAG);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wsvqa_read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
WsVqaDemuxContext *wsvqa = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
int ret = -1;
|
|
unsigned char preamble[VQA_PREAMBLE_SIZE];
|
|
unsigned int chunk_type;
|
|
unsigned int chunk_size;
|
|
int skip_byte;
|
|
|
|
while (get_buffer(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 == SND1_TAG) || (chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) {
|
|
|
|
if (av_new_packet(pkt, chunk_size))
|
|
return AVERROR(EIO);
|
|
ret = get_buffer(pb, pkt->data, chunk_size);
|
|
if (ret != chunk_size) {
|
|
av_free_packet(pkt);
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
if (chunk_type == SND2_TAG) {
|
|
pkt->stream_index = wsvqa->audio_stream_index;
|
|
/* 2 samples/byte, 1 or 2 samples per frame depending on stereo */
|
|
wsvqa->audio_frame_counter += (chunk_size * 2) / wsvqa->audio_channels;
|
|
} else if(chunk_type == SND1_TAG) {
|
|
pkt->stream_index = wsvqa->audio_stream_index;
|
|
/* unpacked size is stored in header */
|
|
wsvqa->audio_frame_counter += AV_RL16(pkt->data) / wsvqa->audio_channels;
|
|
} else {
|
|
pkt->stream_index = wsvqa->video_stream_index;
|
|
}
|
|
/* stay on 16-bit alignment */
|
|
if (skip_byte)
|
|
url_fseek(pb, 1, SEEK_CUR);
|
|
|
|
return ret;
|
|
} else {
|
|
switch(chunk_type){
|
|
case CMDS_TAG:
|
|
case SND0_TAG:
|
|
break;
|
|
default:
|
|
av_log(s, AV_LOG_INFO, "Skipping unknown chunk 0x%08X\n", chunk_type);
|
|
}
|
|
url_fseek(pb, chunk_size + skip_byte, SEEK_CUR);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if CONFIG_WSAUD_DEMUXER
|
|
AVInputFormat wsaud_demuxer = {
|
|
"wsaud",
|
|
NULL_IF_CONFIG_SMALL("Westwood Studios audio format"),
|
|
sizeof(WsAudDemuxContext),
|
|
wsaud_probe,
|
|
wsaud_read_header,
|
|
wsaud_read_packet,
|
|
};
|
|
#endif
|
|
#if CONFIG_WSVQA_DEMUXER
|
|
AVInputFormat wsvqa_demuxer = {
|
|
"wsvqa",
|
|
NULL_IF_CONFIG_SMALL("Westwood Studios VQA format"),
|
|
sizeof(WsVqaDemuxContext),
|
|
wsvqa_probe,
|
|
wsvqa_read_header,
|
|
wsvqa_read_packet,
|
|
};
|
|
#endif
|