}
static void metadata_streaminfo(FLACContext *s);
-static void dump_headers(FLACContext *s);
+static void allocate_buffers(FLACContext *s);
+static int metadata_parse(FLACContext *s);
static int flac_decode_init(AVCodecContext * avctx)
{
FLACContext *s = avctx->priv_data;
s->avctx = avctx;
- /* initialize based on the demuxer-supplied streamdata header */
- if (avctx->extradata_size == FLAC_STREAMINFO_SIZE) {
+ if (avctx->extradata_size > 4) {
+ /* initialize based on the demuxer-supplied streamdata header */
init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
- metadata_streaminfo(s);
- dump_headers(s);
+ if (avctx->extradata_size == FLAC_STREAMINFO_SIZE) {
+ metadata_streaminfo(s);
+ allocate_buffers(s);
+ } else {
+ metadata_parse(s);
+ }
}
return 0;
skip_bits(&s->gb, 64); /* md5 sum */
skip_bits(&s->gb, 64); /* md5 sum */
- allocate_buffers(s);
+ dump_headers(s);
+}
+
+/**
+ * Parse a list of metadata blocks. This list of blocks must begin with
+ * the fLaC marker.
+ * @param s the flac decoding context containing the gb bit reader used to
+ * parse metadata
+ * @return 1 if some metadata was read, 0 if no fLaC marker was found
+ */
+static int metadata_parse(FLACContext *s)
+{
+ int i, metadata_last, metadata_type, metadata_size, streaminfo_updated=0;
+
+ if (show_bits_long(&s->gb, 32) == MKBETAG('f','L','a','C')) {
+ skip_bits(&s->gb, 32);
+
+ av_log(s->avctx, AV_LOG_DEBUG, "STREAM HEADER\n");
+ do {
+ metadata_last = get_bits1(&s->gb);
+ metadata_type = get_bits(&s->gb, 7);
+ metadata_size = get_bits_long(&s->gb, 24);
+
+ av_log(s->avctx, AV_LOG_DEBUG,
+ " metadata block: flag = %d, type = %d, size = %d\n",
+ metadata_last, metadata_type, metadata_size);
+ if (metadata_size) {
+ switch (metadata_type) {
+ case METADATA_TYPE_STREAMINFO:
+ metadata_streaminfo(s);
+ streaminfo_updated = 1;
+ break;
+
+ default:
+ for (i=0; i<metadata_size; i++)
+ skip_bits(&s->gb, 8);
+ }
+ }
+ } while (!metadata_last);
+
+ if (streaminfo_updated)
+ allocate_buffers(s);
+ return 1;
+ }
+ return 0;
}
static int decode_residuals(FLACContext *s, int channel, int pred_order)
rice_order = get_bits(&s->gb, 4);
samples= s->blocksize >> rice_order;
+ if (pred_order > samples) {
+ av_log(s->avctx, AV_LOG_ERROR, "invalid predictor order: %i > %i\n", pred_order, samples);
+ return -1;
+ }
sample=
i= pred_order;
return 0;
}
-static int decode_frame(FLACContext *s)
+static int decode_frame(FLACContext *s, int alloc_data_size)
{
int blocksize_code, sample_rate_code, sample_size_code, assignment, i, crc8;
int decorrelation, bps, blocksize, samplerate;
return -1;
}
+ if(blocksize * s->channels * sizeof(int16_t) > alloc_data_size)
+ return -1;
+
if (sample_rate_code == 0){
samplerate= s->samplerate;
}else if ((sample_rate_code > 3) && (sample_rate_code < 12))
return 0;
}
-static inline int16_t shift_to_16_bits(int32_t data, int bps)
-{
- if (bps == 24) {
- return (data >> 8);
- } else if (bps == 20) {
- return (data >> 4);
- } else {
- return data;
- }
-}
-
static int flac_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
FLACContext *s = avctx->priv_data;
- int metadata_last, metadata_type, metadata_size;
int tmp = 0, i, j = 0, input_buf_size = 0;
int16_t *samples = data;
+ int alloc_data_size= *data_size;
+
+ *data_size=0;
if(s->max_framesize == 0){
s->max_framesize= 65536; // should hopefully be enough for the first header
init_get_bits(&s->gb, buf, buf_size*8);
- /* fLaC signature (be) */
- if (show_bits_long(&s->gb, 32) == bswap_32(ff_get_fourcc("fLaC")))
+ if (!metadata_parse(s))
{
- skip_bits(&s->gb, 32);
-
- av_log(s->avctx, AV_LOG_DEBUG, "STREAM HEADER\n");
- do {
- metadata_last = get_bits(&s->gb, 1);
- metadata_type = get_bits(&s->gb, 7);
- metadata_size = get_bits_long(&s->gb, 24);
-
- av_log(s->avctx, AV_LOG_DEBUG, " metadata block: flag = %d, type = %d, size = %d\n",
- metadata_last, metadata_type,
- metadata_size);
- if(metadata_size){
- switch(metadata_type)
- {
- case METADATA_TYPE_STREAMINFO:{
- metadata_streaminfo(s);
-
- /* Buffer might have been reallocated, reinit bitreader */
- if(buf != &s->bitstream[s->bitstream_index])
- {
- int bits_count = get_bits_count(&s->gb);
- buf= &s->bitstream[s->bitstream_index];
- init_get_bits(&s->gb, buf, buf_size*8);
- skip_bits(&s->gb, bits_count);
- }
-
- dump_headers(s);
- break;}
- default:
- for(i=0; i<metadata_size; i++)
- skip_bits(&s->gb, 8);
- }
- }
- } while(!metadata_last);
- }
- else
- {
-
tmp = show_bits(&s->gb, 16);
if(tmp != 0xFFF8){
av_log(s->avctx, AV_LOG_ERROR, "FRAME HEADER not here\n");
goto end; // we may not have enough bits left to decode a frame, so try next time
}
skip_bits(&s->gb, 16);
- if (decode_frame(s) < 0){
+ if (decode_frame(s, alloc_data_size) < 0){
av_log(s->avctx, AV_LOG_ERROR, "decode_frame() failed\n");
s->bitstream_size=0;
s->bitstream_index=0;
{\
int a= s->decoded[0][i];\
int b= s->decoded[1][i];\
- *(samples++) = (left ) >> (16 - s->bps);\
- *(samples++) = (right) >> (16 - s->bps);\
+ *samples++ = ((left) << (24 - s->bps)) >> 8;\
+ *samples++ = ((right) << (24 - s->bps)) >> 8;\
}\
break;
for (j = 0; j < s->blocksize; j++)
{
for (i = 0; i < s->channels; i++)
- *(samples++) = shift_to_16_bits(s->decoded[i][j], s->bps);
+ *samples++ = (s->decoded[i][j] << (24 - s->bps)) >> 8;
}
break;
case LEFT_SIDE:
projects / ffmpeg / blobdiff