-
-/*************************/
-
-typedef struct MpegAudioParseContext {
- uint8_t inbuf[MPA_MAX_CODED_FRAME_SIZE]; /* input buffer */
- uint8_t *inbuf_ptr;
- int frame_size;
- int free_format_frame_size;
- int free_format_next_header;
- uint32_t header;
- int header_count;
-} MpegAudioParseContext;
-
-#define MPA_HEADER_SIZE 4
-
-/* header + layer + bitrate + freq + lsf/mpeg25 */
-#undef SAME_HEADER_MASK /* mpegaudio.h defines different version */
-#define SAME_HEADER_MASK \
- (0xffe00000 | (3 << 17) | (3 << 10) | (3 << 19))
-
-static int mpegaudio_parse_init(AVCodecParserContext *s1)
-{
- MpegAudioParseContext *s = s1->priv_data;
- s->inbuf_ptr = s->inbuf;
- return 0;
-}
-
-static int mpegaudio_parse(AVCodecParserContext *s1,
- AVCodecContext *avctx,
- uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size)
-{
- MpegAudioParseContext *s = s1->priv_data;
- int len, ret, sr;
- uint32_t header;
- const uint8_t *buf_ptr;
-
- *poutbuf = NULL;
- *poutbuf_size = 0;
- buf_ptr = buf;
- while (buf_size > 0) {
- len = s->inbuf_ptr - s->inbuf;
- if (s->frame_size == 0) {
- /* special case for next header for first frame in free
- format case (XXX: find a simpler method) */
- if (s->free_format_next_header != 0) {
- s->inbuf[0] = s->free_format_next_header >> 24;
- s->inbuf[1] = s->free_format_next_header >> 16;
- s->inbuf[2] = s->free_format_next_header >> 8;
- s->inbuf[3] = s->free_format_next_header;
- s->inbuf_ptr = s->inbuf + 4;
- s->free_format_next_header = 0;
- goto got_header;
- }
- /* no header seen : find one. We need at least MPA_HEADER_SIZE
- bytes to parse it */
- len = MPA_HEADER_SIZE - len;
- if (len > buf_size)
- len = buf_size;
- if (len > 0) {
- memcpy(s->inbuf_ptr, buf_ptr, len);
- buf_ptr += len;
- buf_size -= len;
- s->inbuf_ptr += len;
- }
- if ((s->inbuf_ptr - s->inbuf) >= MPA_HEADER_SIZE) {
- got_header:
- sr= avctx->sample_rate;
- header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
- (s->inbuf[2] << 8) | s->inbuf[3];
-
- ret = mpa_decode_header(avctx, header);
- if (ret < 0) {
- s->header_count= -2;
- /* no sync found : move by one byte (inefficient, but simple!) */
- memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
- s->inbuf_ptr--;
- dprintf("skip %x\n", header);
- /* reset free format frame size to give a chance
- to get a new bitrate */
- s->free_format_frame_size = 0;
- } else {
- if((header&SAME_HEADER_MASK) != (s->header&SAME_HEADER_MASK) && s->header)
- s->header_count= -3;
- s->header= header;
- s->header_count++;
- s->frame_size = ret;
-
-#if 0
- /* free format: prepare to compute frame size */
- if (decode_header(s, header) == 1) {
- s->frame_size = -1;
- }
-#endif
- }
- if(s->header_count <= 0)
- avctx->sample_rate= sr; //FIXME ugly
- }
- } else
-#if 0
- if (s->frame_size == -1) {
- /* free format : find next sync to compute frame size */
- len = MPA_MAX_CODED_FRAME_SIZE - len;
- if (len > buf_size)
- len = buf_size;
- if (len == 0) {
- /* frame too long: resync */
- s->frame_size = 0;
- memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
- s->inbuf_ptr--;
- } else {
- uint8_t *p, *pend;
- uint32_t header1;
- int padding;
-
- memcpy(s->inbuf_ptr, buf_ptr, len);
- /* check for header */
- p = s->inbuf_ptr - 3;
- pend = s->inbuf_ptr + len - 4;
- while (p <= pend) {
- header = (p[0] << 24) | (p[1] << 16) |
- (p[2] << 8) | p[3];
- header1 = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
- (s->inbuf[2] << 8) | s->inbuf[3];
- /* check with high probability that we have a
- valid header */
- if ((header & SAME_HEADER_MASK) ==
- (header1 & SAME_HEADER_MASK)) {
- /* header found: update pointers */
- len = (p + 4) - s->inbuf_ptr;
- buf_ptr += len;
- buf_size -= len;
- s->inbuf_ptr = p;
- /* compute frame size */
- s->free_format_next_header = header;
- s->free_format_frame_size = s->inbuf_ptr - s->inbuf;
- padding = (header1 >> 9) & 1;
- if (s->layer == 1)
- s->free_format_frame_size -= padding * 4;
- else
- s->free_format_frame_size -= padding;
- dprintf("free frame size=%d padding=%d\n",
- s->free_format_frame_size, padding);
- decode_header(s, header1);
- goto next_data;
- }
- p++;
- }
- /* not found: simply increase pointers */
- buf_ptr += len;
- s->inbuf_ptr += len;
- buf_size -= len;
- }
- } else
-#endif
- if (len < s->frame_size) {
- if (s->frame_size > MPA_MAX_CODED_FRAME_SIZE)
- s->frame_size = MPA_MAX_CODED_FRAME_SIZE;
- len = s->frame_size - len;
- if (len > buf_size)
- len = buf_size;
- memcpy(s->inbuf_ptr, buf_ptr, len);
- buf_ptr += len;
- s->inbuf_ptr += len;
- buf_size -= len;
- }
- // next_data:
- if (s->frame_size > 0 &&
- (s->inbuf_ptr - s->inbuf) >= s->frame_size) {
- if(s->header_count > 0){
- *poutbuf = s->inbuf;
- *poutbuf_size = s->inbuf_ptr - s->inbuf;
- }
- s->inbuf_ptr = s->inbuf;
- s->frame_size = 0;
- break;
- }
- }
- return buf_ptr - buf;
-}
-
-/* also used for ADTS AAC */
-typedef struct AC3ParseContext {
- uint8_t *inbuf_ptr;
- int frame_size;
- int header_size;
- int (*sync)(const uint8_t *buf, int *channels, int *sample_rate,
- int *bit_rate, int *samples);
- uint8_t inbuf[8192]; /* input buffer */
-} AC3ParseContext;
-
-#define AC3_HEADER_SIZE 7
-#define AAC_HEADER_SIZE 7
-
-static const int ac3_sample_rates[4] = {
- 48000, 44100, 32000, 0
-};
-
-static const int ac3_frame_sizes[64][3] = {
- { 64, 69, 96 },
- { 64, 70, 96 },
- { 80, 87, 120 },
- { 80, 88, 120 },
- { 96, 104, 144 },
- { 96, 105, 144 },
- { 112, 121, 168 },
- { 112, 122, 168 },
- { 128, 139, 192 },
- { 128, 140, 192 },
- { 160, 174, 240 },
- { 160, 175, 240 },
- { 192, 208, 288 },
- { 192, 209, 288 },
- { 224, 243, 336 },
- { 224, 244, 336 },
- { 256, 278, 384 },
- { 256, 279, 384 },
- { 320, 348, 480 },
- { 320, 349, 480 },
- { 384, 417, 576 },
- { 384, 418, 576 },
- { 448, 487, 672 },
- { 448, 488, 672 },
- { 512, 557, 768 },
- { 512, 558, 768 },
- { 640, 696, 960 },
- { 640, 697, 960 },
- { 768, 835, 1152 },
- { 768, 836, 1152 },
- { 896, 975, 1344 },
- { 896, 976, 1344 },
- { 1024, 1114, 1536 },
- { 1024, 1115, 1536 },
- { 1152, 1253, 1728 },
- { 1152, 1254, 1728 },
- { 1280, 1393, 1920 },
- { 1280, 1394, 1920 },
-};
-
-static const int ac3_bitrates[64] = {
- 32, 32, 40, 40, 48, 48, 56, 56, 64, 64, 80, 80, 96, 96, 112, 112,
- 128, 128, 160, 160, 192, 192, 224, 224, 256, 256, 320, 320, 384,
- 384, 448, 448, 512, 512, 576, 576, 640, 640,
-};
-
-static const int ac3_channels[8] = {
- 2, 1, 2, 3, 3, 4, 4, 5
-};
-
-static int aac_sample_rates[16] = {
- 96000, 88200, 64000, 48000, 44100, 32000,
- 24000, 22050, 16000, 12000, 11025, 8000, 7350
-};
-
-static int aac_channels[8] = {
- 0, 1, 2, 3, 4, 5, 6, 8
-};
-
-static int ac3_sync(const uint8_t *buf, int *channels, int *sample_rate,
- int *bit_rate, int *samples)
-{
- unsigned int fscod, frmsizecod, acmod, bsid, lfeon;
- GetBitContext bits;
-
- init_get_bits(&bits, buf, AC3_HEADER_SIZE * 8);
-
- if(get_bits(&bits, 16) != 0x0b77)
- return 0;
-
- skip_bits(&bits, 16); /* crc */
- fscod = get_bits(&bits, 2);
- frmsizecod = get_bits(&bits, 6);
-
- if(!ac3_sample_rates[fscod])
- return 0;
-
- bsid = get_bits(&bits, 5);
- if(bsid > 8)
- return 0;
- skip_bits(&bits, 3); /* bsmod */
- acmod = get_bits(&bits, 3);
- if(acmod & 1 && acmod != 1)
- skip_bits(&bits, 2); /* cmixlev */
- if(acmod & 4)
- skip_bits(&bits, 2); /* surmixlev */
- if(acmod & 2)
- skip_bits(&bits, 2); /* dsurmod */
- lfeon = get_bits1(&bits);
-
- *sample_rate = ac3_sample_rates[fscod];
- *bit_rate = ac3_bitrates[frmsizecod] * 1000;
- *channels = ac3_channels[acmod] + lfeon;
- *samples = 6 * 256;
-
- return ac3_frame_sizes[frmsizecod][fscod] * 2;
-}
-
-static int aac_sync(const uint8_t *buf, int *channels, int *sample_rate,
- int *bit_rate, int *samples)
-{
- GetBitContext bits;
- int size, rdb, ch, sr;
-
- init_get_bits(&bits, buf, AAC_HEADER_SIZE * 8);
-
- if(get_bits(&bits, 12) != 0xfff)
- return 0;
-
- 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 */
- if(!aac_sample_rates[sr])
- return 0;
- skip_bits1(&bits); /* private_bit */
- ch = get_bits(&bits, 3); /* channel_configuration */
- if(!aac_channels[ch])
- return 0;
- skip_bits1(&bits); /* original/copy */
- skip_bits1(&bits); /* 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_bits(&bits, 11); /* adts_buffer_fullness */
- rdb = get_bits(&bits, 2); /* number_of_raw_data_blocks_in_frame */
-
- *channels = aac_channels[ch];
- *sample_rate = aac_sample_rates[sr];
- *samples = (rdb + 1) * 1024;
- *bit_rate = size * 8 * *sample_rate / *samples;
-
- return size;
-}
-
-static int ac3_parse_init(AVCodecParserContext *s1)
-{
- AC3ParseContext *s = s1->priv_data;
- s->inbuf_ptr = s->inbuf;
- s->header_size = AC3_HEADER_SIZE;
- s->sync = ac3_sync;
- return 0;
-}
-
-static int aac_parse_init(AVCodecParserContext *s1)
-{
- AC3ParseContext *s = s1->priv_data;
- s->inbuf_ptr = s->inbuf;
- s->header_size = AAC_HEADER_SIZE;
- s->sync = aac_sync;
- return 0;
-}
-
-/* also used for ADTS AAC */
-static int ac3_parse(AVCodecParserContext *s1,
- AVCodecContext *avctx,
- uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size)
-{
- AC3ParseContext *s = s1->priv_data;
- const uint8_t *buf_ptr;
- int len, sample_rate, bit_rate, channels, samples;
-
- *poutbuf = NULL;
- *poutbuf_size = 0;
-
- buf_ptr = buf;
- while (buf_size > 0) {
- len = s->inbuf_ptr - s->inbuf;
- if (s->frame_size == 0) {
- /* no header seen : find one. We need at least s->header_size
- bytes to parse it */
- len = FFMIN(s->header_size - len, buf_size);
-
- memcpy(s->inbuf_ptr, buf_ptr, len);
- buf_ptr += len;
- s->inbuf_ptr += len;
- buf_size -= len;
- if ((s->inbuf_ptr - s->inbuf) == s->header_size) {
- len = s->sync(s->inbuf, &channels, &sample_rate, &bit_rate,
- &samples);
- if (len == 0) {
- /* no sync found : move by one byte (inefficient, but simple!) */
- memmove(s->inbuf, s->inbuf + 1, s->header_size - 1);
- s->inbuf_ptr--;
- } else {
- s->frame_size = len;
- /* update codec info */
- avctx->sample_rate = sample_rate;
- /* set channels,except if the user explicitly requests 1 or 2 channels, XXX/FIXME this is a bit ugly */
- if(avctx->codec_id == CODEC_ID_AC3){
- if(avctx->channels!=1 && avctx->channels!=2){
- avctx->channels = channels;
- }
- } else {
- avctx->channels = channels;
- }
- avctx->bit_rate = bit_rate;
- avctx->frame_size = samples;
- }
- }
- } else {
- len = FFMIN(s->frame_size - len, buf_size);
-
- memcpy(s->inbuf_ptr, buf_ptr, len);
- buf_ptr += len;
- s->inbuf_ptr += len;
- buf_size -= len;
-
- if(s->inbuf_ptr - s->inbuf == s->frame_size){
- *poutbuf = s->inbuf;
- *poutbuf_size = s->frame_size;
- s->inbuf_ptr = s->inbuf;
- s->frame_size = 0;
- break;
- }
- }
- }
- return buf_ptr - buf;
-}
-
-AVCodecParser mpegvideo_parser = {
- { CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO },
- sizeof(ParseContext1),
- NULL,
- mpegvideo_parse,
- parse1_close,
- mpegvideo_split,
-};
-
-AVCodecParser mpeg4video_parser = {
- { CODEC_ID_MPEG4 },
- sizeof(ParseContext1),
- mpeg4video_parse_init,
- mpeg4video_parse,
- parse1_close,
- mpeg4video_split,
-};
-
-AVCodecParser cavsvideo_parser = {
- { CODEC_ID_CAVS },
- sizeof(ParseContext1),
- NULL,
- cavsvideo_parse,
- parse1_close,
- mpeg4video_split,
-};
-
-AVCodecParser mpegaudio_parser = {
- { CODEC_ID_MP2, CODEC_ID_MP3 },
- sizeof(MpegAudioParseContext),
- mpegaudio_parse_init,
- mpegaudio_parse,
- NULL,
-};
-
-AVCodecParser ac3_parser = {
- { CODEC_ID_AC3 },
- sizeof(AC3ParseContext),
- ac3_parse_init,
- ac3_parse,
- NULL,
-};
-
-AVCodecParser aac_parser = {
- { CODEC_ID_AAC },
- sizeof(AC3ParseContext),
- aac_parse_init,
- ac3_parse,
- NULL,
-};