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avcodec/aac_ac3_parser: don't fill stream info in the sync function 

Have it only find frame boundaries. The stream props will then be filled once
we have an assembled frame.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2022-10-22 16:30:52 -03:00
parent 676e7d7f9b
commit b5abf6fdfc
4 changed files with 53 additions and 45 deletions
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63
libavcodec/aac_ac3_parser.c
View File

@ -26,6 +26,8 @@
#include "libavutil/common.h"
#include "parser.h"
#include "aac_ac3_parser.h"
#include "ac3_parser_internal.h"
#include "adts_header.h"
int ff_aac_ac3_parse(AVCodecParserContext *s1,
AVCodecContext *avctx,
@ -48,7 +50,7 @@ get_next:
len=0;
for(i=s->remaining_size; i<buf_size; i++){
s->state = (s->state<<8) + buf[i];
if((len=s->sync(s->state, s, &s->need_next_header, &new_frame_start)))
if((len=s->sync(s->state, &s->need_next_header, &new_frame_start)))
break;
}
if(len<=0){
@ -79,42 +81,77 @@ get_next:
*poutbuf = buf;
*poutbuf_size = buf_size;
/* update codec info */
if(s->codec_id)
avctx->codec_id = s->codec_id;
if (got_frame) {
int bit_rate;
/* Due to backwards compatible HE-AAC the sample rate, channel count,
and total number of samples found in an AAC ADTS header are not
reliable. Bit rate is still accurate because the total frame
duration in seconds is still correct (as is the number of bits in
the frame). */
if (avctx->codec_id != AV_CODEC_ID_AAC) {
avctx->sample_rate = s->sample_rate;
AC3HeaderInfo hdr, *phrd = &hdr;
int offset = ff_ac3_find_syncword(buf, buf_size);
if (offset < 0)
return i;
buf += offset;
buf_size -= offset;
while (buf_size > 0) {
int ret = avpriv_ac3_parse_header(&phrd, buf, buf_size);
if (ret < 0 || hdr.frame_size > buf_size)
return i;
if (buf_size > hdr.frame_size) {
buf += hdr.frame_size;
buf_size -= hdr.frame_size;
continue;
}
break;
}
avctx->sample_rate = hdr.sample_rate;
if (hdr.bitstream_id > 10)
avctx->codec_id = AV_CODEC_ID_EAC3;
if (!CONFIG_EAC3_DECODER || avctx->codec_id != AV_CODEC_ID_EAC3) {
av_channel_layout_uninit(&avctx->ch_layout);
if (s->channel_layout) {
av_channel_layout_from_mask(&avctx->ch_layout, s->channel_layout);
if (hdr.channel_layout) {
av_channel_layout_from_mask(&avctx->ch_layout, hdr.channel_layout);
} else {
avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
avctx->ch_layout.nb_channels = s->channels;
avctx->ch_layout.nb_channels = hdr.channels;
}
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
avctx->channels = avctx->ch_layout.nb_channels;
avctx->channel_layout = s->channel_layout;
avctx->channel_layout = hdr.channel_layout;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
}
s1->duration = s->samples;
avctx->audio_service_type = s->service_type;
s1->duration = hdr.num_blocks * 256;
avctx->audio_service_type = hdr.bitstream_mode;
if (hdr.bitstream_mode == 0x7 && hdr.channels > 1)
avctx->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
bit_rate = hdr.bit_rate;
} else {
AACADTSHeaderInfo hdr, *phrd = &hdr;
int ret = avpriv_adts_header_parse(&phrd, buf, buf_size);
if (ret < 0)
return i;
bit_rate = hdr.bit_rate;
}
/* Calculate the average bit rate */
s->frame_number++;
if (!CONFIG_EAC3_DECODER || avctx->codec_id != AV_CODEC_ID_EAC3) {
avctx->bit_rate +=
(s->bit_rate - avctx->bit_rate) / s->frame_number;
(bit_rate - avctx->bit_rate) / s->frame_number;
}
}

12
libavcodec/aac_ac3_parser.h
View File

@ -39,24 +39,14 @@ typedef enum {
typedef struct AACAC3ParseContext {
ParseContext pc;
int frame_size;
int header_size;
int (*sync)(uint64_t state, struct AACAC3ParseContext *hdr_info,
int *need_next_header, int *new_frame_start);
int channels;
int sample_rate;
int bit_rate;
int samples;
uint64_t channel_layout;
int service_type;
int (*sync)(uint64_t state, int *need_next_header, int *new_frame_start);
int remaining_size;
uint64_t state;
int need_next_header;
int frame_number;
enum AVCodecID codec_id;
} AACAC3ParseContext;
int ff_aac_ac3_parse(AVCodecParserContext *s1,

7
libavcodec/aac_parser.c
View File

@ -27,8 +27,7 @@
#include "get_bits.h"
#include "mpeg4audio.h"
static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,
int *need_next_header, int *new_frame_start)
static int aac_sync(uint64_t state, int *need_next_header, int *new_frame_start)
{
GetBitContext bits;
AACADTSHeaderInfo hdr;
@ -46,10 +45,6 @@ static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,
return 0;
*need_next_header = 0;
*new_frame_start = 1;
hdr_info->sample_rate = hdr.sample_rate;
hdr_info->channels = ff_mpeg4audio_channels[hdr.chan_config];
hdr_info->samples = hdr.samples;
hdr_info->bit_rate = hdr.bit_rate;
return size;
}

16
libavcodec/ac3_parser.c
View File

@ -215,8 +215,7 @@ int av_ac3_parse_header(const uint8_t *buf, size_t size,
return 0;
}
static int ac3_sync(uint64_t state, AACAC3ParseContext *hdr_info,
int *need_next_header, int *new_frame_start)
static int ac3_sync(uint64_t state, int *need_next_header, int *new_frame_start)
{
int err;
union {
@ -238,19 +237,6 @@ static int ac3_sync(uint64_t state, AACAC3ParseContext *hdr_info,
if(err < 0)
return 0;
hdr_info->sample_rate = hdr.sample_rate;
hdr_info->bit_rate = hdr.bit_rate;
hdr_info->channels = hdr.channels;
hdr_info->channel_layout = hdr.channel_layout;
hdr_info->samples = hdr.num_blocks * 256;
hdr_info->service_type = hdr.bitstream_mode;
if (hdr.bitstream_mode == 0x7 && hdr.channels > 1)
hdr_info->service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
if(hdr.bitstream_id>10)
hdr_info->codec_id = AV_CODEC_ID_EAC3;
else if (hdr_info->codec_id == AV_CODEC_ID_NONE)
hdr_info->codec_id = AV_CODEC_ID_AC3;
*new_frame_start = (hdr.frame_type != EAC3_FRAME_TYPE_DEPENDENT);
*need_next_header = *new_frame_start || (hdr.frame_type != EAC3_FRAME_TYPE_AC3_CONVERT);
return hdr.frame_size;