/*
* Audio and Video frame extraction
- * Copyright (c) 2003 Fabrice Bellard.
- * Copyright (c) 2003 Michael Niedermayer.
+ * Copyright (c) 2003 Fabrice Bellard
+ * Copyright (c) 2003 Michael Niedermayer
*
* This file is part of FFmpeg.
*
#include "parser.h"
#include "aac_ac3_parser.h"
+#include "aac_parser.h"
#include "bitstream.h"
#include "mpeg4audio.h"
#define AAC_HEADER_SIZE 7
-static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,
- int *need_next_header, int *new_frame_start)
+int ff_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr)
{
- GetBitContext bits;
int size, rdb, ch, sr;
- uint64_t tmp = be2me_64(state);
+ int aot, crc_abs;
- init_get_bits(&bits, (uint8_t *)&tmp, AAC_HEADER_SIZE * 8);
-
- if(get_bits(&bits, 12) != 0xfff)
- return 0;
+ if(get_bits(gbc, 12) != 0xfff)
+ return AAC_AC3_PARSE_ERROR_SYNC;
- skip_bits1(&bits); /* id */
- skip_bits(&bits, 2); /* layer */
- skip_bits1(&bits); /* protection_absent */
- skip_bits(&bits, 2); /* profile_objecttype */
- sr = get_bits(&bits, 4); /* sample_frequency_index */
+ skip_bits1(gbc); /* id */
+ skip_bits(gbc, 2); /* layer */
+ crc_abs = get_bits1(gbc); /* protection_absent */
+ aot = get_bits(gbc, 2); /* profile_objecttype */
+ sr = get_bits(gbc, 4); /* sample_frequency_index */
if(!ff_mpeg4audio_sample_rates[sr])
- return 0;
- skip_bits1(&bits); /* private_bit */
- ch = get_bits(&bits, 3); /* channel_configuration */
+ return AAC_AC3_PARSE_ERROR_SAMPLE_RATE;
+ skip_bits1(gbc); /* private_bit */
+ ch = get_bits(gbc, 3); /* channel_configuration */
+
if(!ff_mpeg4audio_channels[ch])
- return 0;
- skip_bits1(&bits); /* original/copy */
- skip_bits1(&bits); /* home */
+ return AAC_AC3_PARSE_ERROR_CHANNEL_CFG;
+
+ skip_bits1(gbc); /* original/copy */
+ skip_bits1(gbc); /* home */
/* adts_variable_header */
- skip_bits1(&bits); /* copyright_identification_bit */
- skip_bits1(&bits); /* copyright_identification_start */
- size = get_bits(&bits, 13); /* aac_frame_length */
+ skip_bits1(gbc); /* copyright_identification_bit */
+ skip_bits1(gbc); /* copyright_identification_start */
+ size = get_bits(gbc, 13); /* aac_frame_length */
if(size < AAC_HEADER_SIZE)
- return 0;
+ return AAC_AC3_PARSE_ERROR_FRAME_SIZE;
- skip_bits(&bits, 11); /* adts_buffer_fullness */
- rdb = get_bits(&bits, 2); /* number_of_raw_data_blocks_in_frame */
+ skip_bits(gbc, 11); /* adts_buffer_fullness */
+ rdb = get_bits(gbc, 2); /* number_of_raw_data_blocks_in_frame */
- hdr_info->channels = ff_mpeg4audio_channels[ch];
- hdr_info->sample_rate = ff_mpeg4audio_sample_rates[sr];
- hdr_info->samples = (rdb + 1) * 1024;
- hdr_info->bit_rate = size * 8 * hdr_info->sample_rate / hdr_info->samples;
+ hdr->object_type = aot;
+ hdr->chan_config = ch;
+ hdr->crc_absent = crc_abs;
+ hdr->num_aac_frames = rdb + 1;
+ hdr->sampling_index = sr;
+ hdr->sample_rate = ff_mpeg4audio_sample_rates[sr];
+ hdr->samples = (rdb + 1) * 1024;
+ hdr->bit_rate = size * 8 * hdr->sample_rate / hdr->samples;
- *need_next_header=0;
- *new_frame_start=1;
+ return size;
+}
+
+static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,
+ int *need_next_header, int *new_frame_start)
+{
+ GetBitContext bits;
+ AACADTSHeaderInfo hdr;
+ int size;
+ union {
+ uint64_t u64;
+ uint8_t u8[8];
+ } tmp;
+
+ tmp.u64 = be2me_64(state);
+ init_get_bits(&bits, tmp.u8+8-AAC_HEADER_SIZE, AAC_HEADER_SIZE * 8);
+
+ if ((size = ff_aac_parse_header(&bits, &hdr)) < 0)
+ 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;
}