* qualify a file. Refer to wsaud_probe() for the precise parameters.
*/
+#include "libavutil/intreadwrite.h"
#include "avformat.h"
#define AUD_HEADER_SIZE 12
int audio_samplerate;
int audio_channels;
int audio_bits;
- int audio_type;
+ enum CodecID audio_type;
int audio_stream_index;
int64_t audio_frame_counter;
} WsAudDemuxContext;
/* 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
- * There is a total of 24 bits. The number space contains 2^24 =
- * 16777216 numbers. There are 40001 * 2 = 80002 acceptable combinations
- * of numbers. There is a 80002/16777216 = 0.48% chance of a false
- * positive.
+ * 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)
+ if (p->buf_size < AUD_HEADER_SIZE + AUD_CHUNK_PREAMBLE_SIZE)
return 0;
/* check sample rate */
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;
}
AVFormatParameters *ap)
{
WsAudDemuxContext *wsaud = s->priv_data;
- ByteIOContext *pb = &s->pb;
+ 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_IO;
+ return AVERROR(EIO);
wsaud->audio_samplerate = AV_RL16(&header[0]);
if (header[11] == 99)
wsaud->audio_type = CODEC_ID_ADPCM_IMA_WS;
st->codec->codec_tag = 0; /* no tag */
st->codec->channels = wsaud->audio_channels;
st->codec->sample_rate = wsaud->audio_samplerate;
- st->codec->bits_per_sample = wsaud->audio_bits;
+ st->codec->bits_per_coded_sample = wsaud->audio_bits;
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
- st->codec->bits_per_sample / 4;
- st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
+ 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;
AVPacket *pkt)
{
WsAudDemuxContext *wsaud = s->priv_data;
- ByteIOContext *pb = &s->pb;
+ 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_IO;
+ return AVERROR(EIO);
/* validate the chunk */
if (AV_RL32(&preamble[4]) != AUD_CHUNK_SIGNATURE)
chunk_size = AV_RL16(&preamble[0]);
ret= av_get_packet(pb, pkt, chunk_size);
if (ret != chunk_size)
- return AVERROR_IO;
+ return AVERROR(EIO);
pkt->stream_index = wsaud->audio_stream_index;
pkt->pts = wsaud->audio_frame_counter;
pkt->pts /= wsaud->audio_samplerate;
return ret;
}
-static int wsaud_read_close(AVFormatContext *s)
-{
-// WsAudDemuxContext *wsaud = s->priv_data;
-
- return 0;
-}
-
-
static int wsvqa_probe(AVProbeData *p)
{
/* need 12 bytes to qualify */
AVFormatParameters *ap)
{
WsVqaDemuxContext *wsvqa = s->priv_data;
- ByteIOContext *pb = &s->pb;
+ ByteIOContext *pb = s->pb;
AVStream *st;
unsigned char *header;
unsigned char scratch[VQA_PREAMBLE_SIZE];
if (get_buffer(pb, st->codec->extradata, VQA_HEADER_SIZE) !=
VQA_HEADER_SIZE) {
av_free(st->codec->extradata);
- return AVERROR_IO;
+ return AVERROR(EIO);
}
st->codec->width = AV_RL16(&header[6]);
st->codec->height = AV_RL16(&header[8]);
st->codec->channels = header[26];
if (!st->codec->channels)
st->codec->channels = 1;
- st->codec->bits_per_sample = 16;
+ st->codec->bits_per_coded_sample = 16;
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
- st->codec->bits_per_sample / 4;
- st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
+ 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;
do {
if (get_buffer(pb, scratch, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE) {
av_free(st->codec->extradata);
- return AVERROR_IO;
+ return AVERROR(EIO);
}
chunk_tag = AV_RB32(&scratch[0]);
chunk_size = AV_RB32(&scratch[4]);
AVPacket *pkt)
{
WsVqaDemuxContext *wsvqa = s->priv_data;
- ByteIOContext *pb = &s->pb;
+ ByteIOContext *pb = s->pb;
int ret = -1;
unsigned char preamble[VQA_PREAMBLE_SIZE];
unsigned int chunk_type;
if ((chunk_type == SND1_TAG) || (chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) {
if (av_new_packet(pkt, chunk_size))
- return AVERROR_IO;
+ return AVERROR(EIO);
ret = get_buffer(pb, pkt->data, chunk_size);
if (ret != chunk_size) {
av_free_packet(pkt);
- return AVERROR_IO;
+ return AVERROR(EIO);
}
if (chunk_type == SND2_TAG) {
return ret;
}
-static int wsvqa_read_close(AVFormatContext *s)
-{
-// WsVqaDemuxContext *wsvqa = s->priv_data;
-
- return 0;
-}
-
-#ifdef CONFIG_WSAUD_DEMUXER
+#if CONFIG_WSAUD_DEMUXER
AVInputFormat wsaud_demuxer = {
"wsaud",
- "Westwood Studios audio format",
+ NULL_IF_CONFIG_SMALL("Westwood Studios audio format"),
sizeof(WsAudDemuxContext),
wsaud_probe,
wsaud_read_header,
wsaud_read_packet,
- wsaud_read_close,
};
#endif
-#ifdef CONFIG_WSVQA_DEMUXER
+#if CONFIG_WSVQA_DEMUXER
AVInputFormat wsvqa_demuxer = {
"wsvqa",
- "Westwood Studios VQA format",
+ NULL_IF_CONFIG_SMALL("Westwood Studios VQA format"),
sizeof(WsVqaDemuxContext),
wsvqa_probe,
wsvqa_read_header,
wsvqa_read_packet,
- wsvqa_read_close,
};
#endif
projects / ffmpeg / blobdiff