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dcadec: scan for extensions in a separate function 

to make dca_decode_frame more readable

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Alexandra Hájková 2015-09-15 13:11:32 +02:00 committed by Luca Barbato
parent 22cc57da64
commit 971177f751
1 changed files with 62 additions and 52 deletions
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114
libavcodec/dcadec.c
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@ -1142,60 +1142,10 @@ static float dca_dmix_code(unsigned code)
return ((ff_dca_dmixtable[code] ^ sign) - sign) * (1.0 / (1U << 15));
}
/**
* Main frame decoding function
* FIXME add arguments
*/
static int dca_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
static int scan_for_extensions(AVCodecContext *avctx)
{
AVFrame *frame = data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int lfe_samples;
int num_core_channels = 0;
int i, ret;
float **samples_flt;
DCAContext *s = avctx->priv_data;
int channels, full_channels;
int core_ss_end;
int upsample = 0;
s->exss_ext_mask = 0;
s->xch_present = 0;
s->dca_buffer_size = ff_dca_convert_bitstream(buf, buf_size, s->dca_buffer,
DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE);
if (s->dca_buffer_size == AVERROR_INVALIDDATA) {
av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");
return AVERROR_INVALIDDATA;
}
if ((ret = dca_parse_frame_header(s)) < 0) {
// seems like the frame is corrupt, try with the next one
return ret;
}
// set AVCodec values with parsed data
avctx->sample_rate = s->sample_rate;
avctx->bit_rate = s->bit_rate;
s->profile = FF_PROFILE_DTS;
for (i = 0; i < (s->sample_blocks / 8); i++) {
if ((ret = dca_decode_block(s, 0, i))) {
av_log(avctx, AV_LOG_ERROR, "error decoding block\n");
return ret;
}
}
/* record number of core channels incase less than max channels are requested */
num_core_channels = s->prim_channels;
if (s->ext_coding)
s->core_ext_mask = dca_ext_audio_descr_mask[s->ext_descr];
else
s->core_ext_mask = 0;
int core_ss_end, ret;
core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;
@ -1211,6 +1161,7 @@ static int dca_decode_frame(AVCodecContext *avctx, void *data,
while (core_ss_end - get_bits_count(&s->gb) >= 32) {
uint32_t bits = get_bits_long(&s->gb, 32);
int i;
switch (bits) {
case DCA_SYNCWORD_XCH: {
@ -1290,6 +1241,65 @@ static int dca_decode_frame(AVCodecContext *avctx, void *data,
get_bits_long(&s->gb, 32) == DCA_SYNCWORD_SUBSTREAM)
ff_dca_exss_parse_header(s);
return ret;
}
/**
* Main frame decoding function
* FIXME add arguments
*/
static int dca_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
AVFrame *frame = data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int lfe_samples;
int num_core_channels = 0;
int i, ret;
float **samples_flt;
DCAContext *s = avctx->priv_data;
int channels, full_channels;
int upsample = 0;
s->exss_ext_mask = 0;
s->xch_present = 0;
s->dca_buffer_size = ff_dca_convert_bitstream(buf, buf_size, s->dca_buffer,
DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE);
if (s->dca_buffer_size == AVERROR_INVALIDDATA) {
av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");
return AVERROR_INVALIDDATA;
}
if ((ret = dca_parse_frame_header(s)) < 0) {
// seems like the frame is corrupt, try with the next one
return ret;
}
// set AVCodec values with parsed data
avctx->sample_rate = s->sample_rate;
avctx->bit_rate = s->bit_rate;
s->profile = FF_PROFILE_DTS;
for (i = 0; i < (s->sample_blocks / 8); i++) {
if ((ret = dca_decode_block(s, 0, i))) {
av_log(avctx, AV_LOG_ERROR, "error decoding block\n");
return ret;
}
}
/* record number of core channels incase less than max channels are requested */
num_core_channels = s->prim_channels;
if (s->ext_coding)
s->core_ext_mask = dca_ext_audio_descr_mask[s->ext_descr];
else
s->core_ext_mask = 0;
ret = scan_for_extensions(avctx);
avctx->profile = s->profile;
full_channels = channels = s->prim_channels + !!s->lfe;