diff options
Diffstat (limited to 'contrib/ffmpeg/libavcodec/parser.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/parser.c | 860 |
1 files changed, 860 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/parser.c b/contrib/ffmpeg/libavcodec/parser.c new file mode 100644 index 000000000..72a3e55a3 --- /dev/null +++ b/contrib/ffmpeg/libavcodec/parser.c @@ -0,0 +1,860 @@ +/* + * Audio and Video frame extraction + * Copyright (c) 2003 Fabrice Bellard. + * Copyright (c) 2003 Michael Niedermayer. + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include "avcodec.h" +#include "mpegvideo.h" +#include "mpegaudio.h" +#include "parser.h" + +AVCodecParser *av_first_parser = NULL; + +void av_register_codec_parser(AVCodecParser *parser) +{ + parser->next = av_first_parser; + av_first_parser = parser; +} + +AVCodecParserContext *av_parser_init(int codec_id) +{ + AVCodecParserContext *s; + AVCodecParser *parser; + int ret; + + if(codec_id == CODEC_ID_NONE) + return NULL; + + for(parser = av_first_parser; parser != NULL; parser = parser->next) { + if (parser->codec_ids[0] == codec_id || + parser->codec_ids[1] == codec_id || + parser->codec_ids[2] == codec_id || + parser->codec_ids[3] == codec_id || + parser->codec_ids[4] == codec_id) + goto found; + } + return NULL; + found: + s = av_mallocz(sizeof(AVCodecParserContext)); + if (!s) + return NULL; + s->parser = parser; + s->priv_data = av_mallocz(parser->priv_data_size); + if (!s->priv_data) { + av_free(s); + return NULL; + } + if (parser->parser_init) { + ret = parser->parser_init(s); + if (ret != 0) { + av_free(s->priv_data); + av_free(s); + return NULL; + } + } + s->fetch_timestamp=1; + return s; +} + +/** + * + * @param buf input + * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output) + * @param pts input presentation timestamp + * @param dts input decoding timestamp + * @param poutbuf will contain a pointer to the first byte of the output frame + * @param poutbuf_size will contain the length of the output frame + * @return the number of bytes of the input bitstream used + * + * Example: + * @code + * while(in_len){ + * len = av_parser_parse(myparser, AVCodecContext, &data, &size, + * in_data, in_len, + * pts, dts); + * in_data += len; + * in_len -= len; + * + * decode_frame(data, size); + * } + * @endcode + */ +int av_parser_parse(AVCodecParserContext *s, + AVCodecContext *avctx, + uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size, + int64_t pts, int64_t dts) +{ + int index, i, k; + uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE]; + + if (buf_size == 0) { + /* padding is always necessary even if EOF, so we add it here */ + memset(dummy_buf, 0, sizeof(dummy_buf)); + buf = dummy_buf; + } else { + /* add a new packet descriptor */ + k = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1); + s->cur_frame_start_index = k; + s->cur_frame_offset[k] = s->cur_offset; + s->cur_frame_pts[k] = pts; + s->cur_frame_dts[k] = dts; + + /* fill first PTS/DTS */ + if (s->fetch_timestamp){ + s->fetch_timestamp=0; + s->last_pts = pts; + s->last_dts = dts; + s->cur_frame_pts[k] = + s->cur_frame_dts[k] = AV_NOPTS_VALUE; + } + } + + /* WARNING: the returned index can be negative */ + index = s->parser->parser_parse(s, avctx, poutbuf, poutbuf_size, buf, buf_size); +//av_log(NULL, AV_LOG_DEBUG, "parser: in:%"PRId64", %"PRId64", out:%"PRId64", %"PRId64", in:%d out:%d id:%d\n", pts, dts, s->last_pts, s->last_dts, buf_size, *poutbuf_size, avctx->codec_id); + /* update the file pointer */ + if (*poutbuf_size) { + /* fill the data for the current frame */ + s->frame_offset = s->last_frame_offset; + s->pts = s->last_pts; + s->dts = s->last_dts; + + /* offset of the next frame */ + s->last_frame_offset = s->cur_offset + index; + /* find the packet in which the new frame starts. It + is tricky because of MPEG video start codes + which can begin in one packet and finish in + another packet. In the worst case, an MPEG + video start code could be in 4 different + packets. */ + k = s->cur_frame_start_index; + for(i = 0; i < AV_PARSER_PTS_NB; i++) { + if (s->last_frame_offset >= s->cur_frame_offset[k]) + break; + k = (k - 1) & (AV_PARSER_PTS_NB - 1); + } + + s->last_pts = s->cur_frame_pts[k]; + s->last_dts = s->cur_frame_dts[k]; + + /* some parsers tell us the packet size even before seeing the first byte of the next packet, + so the next pts/dts is in the next chunk */ + if(index == buf_size){ + s->fetch_timestamp=1; + } + } + if (index < 0) + index = 0; + s->cur_offset += index; + return index; +} + +/** + * + * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed + * @deprecated use AVBitstreamFilter + */ +int av_parser_change(AVCodecParserContext *s, + AVCodecContext *avctx, + uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size, int keyframe){ + + if(s && s->parser->split){ + if((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)){ + int i= s->parser->split(avctx, buf, buf_size); + buf += i; + buf_size -= i; + } + } + + /* cast to avoid warning about discarding qualifiers */ + *poutbuf= (uint8_t *) buf; + *poutbuf_size= buf_size; + if(avctx->extradata){ + if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)) + /*||(s->pict_type != I_TYPE && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_NOKEY))*/ + /*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){ + int size= buf_size + avctx->extradata_size; + *poutbuf_size= size; + *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); + + memcpy(*poutbuf, avctx->extradata, avctx->extradata_size); + memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); + return 1; + } + } + + return 0; +} + +void av_parser_close(AVCodecParserContext *s) +{ + if (s->parser->parser_close) + s->parser->parser_close(s); + av_free(s->priv_data); + av_free(s); +} + +/*****************************************************/ + +/** + * combines the (truncated) bitstream to a complete frame + * @returns -1 if no complete frame could be created + */ +int ff_combine_frame(ParseContext *pc, int next, uint8_t **buf, int *buf_size) +{ +#if 0 + if(pc->overread){ + printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index); + printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]); + } +#endif + + /* copy overreaded bytes from last frame into buffer */ + for(; pc->overread>0; pc->overread--){ + pc->buffer[pc->index++]= pc->buffer[pc->overread_index++]; + } + + /* flush remaining if EOF */ + if(!*buf_size && next == END_NOT_FOUND){ + next= 0; + } + + pc->last_index= pc->index; + + /* copy into buffer end return */ + if(next == END_NOT_FOUND){ + pc->buffer= av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE); + + memcpy(&pc->buffer[pc->index], *buf, *buf_size); + pc->index += *buf_size; + return -1; + } + + *buf_size= + pc->overread_index= pc->index + next; + + /* append to buffer */ + if(pc->index){ + pc->buffer= av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE); + + memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE ); + pc->index = 0; + *buf= pc->buffer; + } + + /* store overread bytes */ + for(;next < 0; next++){ + pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next]; + pc->overread++; + } + +#if 0 + if(pc->overread){ + printf("overread %d, state:%X next:%d index:%d o_index:%d\n", pc->overread, pc->state, next, pc->index, pc->overread_index); + printf("%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]); + } +#endif + + return 0; +} + +void ff_parse_close(AVCodecParserContext *s) +{ + ParseContext *pc = s->priv_data; + + av_free(pc->buffer); +} + +void ff_parse1_close(AVCodecParserContext *s) +{ + ParseContext1 *pc1 = s->priv_data; + + av_free(pc1->pc.buffer); + av_free(pc1->enc); +} + +/*************************/ + +#ifdef CONFIG_MPEG4VIDEO_PARSER +/* used by parser */ +/* XXX: make it use less memory */ +static int av_mpeg4_decode_header(AVCodecParserContext *s1, + AVCodecContext *avctx, + const uint8_t *buf, int buf_size) +{ + ParseContext1 *pc = s1->priv_data; + MpegEncContext *s = pc->enc; + GetBitContext gb1, *gb = &gb1; + int ret; + + s->avctx = avctx; + s->current_picture_ptr = &s->current_picture; + + if (avctx->extradata_size && pc->first_picture){ + init_get_bits(gb, avctx->extradata, avctx->extradata_size*8); + ret = ff_mpeg4_decode_picture_header(s, gb); + } + + init_get_bits(gb, buf, 8 * buf_size); + ret = ff_mpeg4_decode_picture_header(s, gb); + if (s->width) { + avcodec_set_dimensions(avctx, s->width, s->height); + } + s1->pict_type= s->pict_type; + pc->first_picture = 0; + return ret; +} + +static int mpeg4video_parse_init(AVCodecParserContext *s) +{ + ParseContext1 *pc = s->priv_data; + + pc->enc = av_mallocz(sizeof(MpegEncContext)); + if (!pc->enc) + return -1; + pc->first_picture = 1; + return 0; +} + +static int mpeg4video_parse(AVCodecParserContext *s, + AVCodecContext *avctx, + uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size) +{ + ParseContext *pc = s->priv_data; + int next; + + if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){ + next= buf_size; + }else{ + next= ff_mpeg4_find_frame_end(pc, buf, buf_size); + + if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) { + *poutbuf = NULL; + *poutbuf_size = 0; + return buf_size; + } + } + av_mpeg4_decode_header(s, avctx, buf, buf_size); + + *poutbuf = (uint8_t *)buf; + *poutbuf_size = buf_size; + return next; +} +#endif + +int ff_mpeg4video_split(AVCodecContext *avctx, + const uint8_t *buf, int buf_size) +{ + int i; + uint32_t state= -1; + + for(i=0; i<buf_size; i++){ + state= (state<<8) | buf[i]; + if(state == 0x1B3 || state == 0x1B6) + return i-3; + } + return 0; +} + +/*************************/ + +#ifdef CONFIG_MPEGAUDIO_PARSER +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 = FFMIN(MPA_HEADER_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: + header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) | + (s->inbuf[2] << 8) | s->inbuf[3]; + + ret = mpa_decode_header(avctx, header, &sr); + 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 > 1) + avctx->sample_rate= sr; + } + } 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 = 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->frame_size > 0 && buf_ptr - buf == s->inbuf_ptr - s->inbuf + && buf_size + buf_ptr - buf >= s->frame_size){ + if(s->header_count > 0){ + *poutbuf = buf; + *poutbuf_size = s->frame_size; + } + buf_ptr = buf + s->frame_size; + s->inbuf_ptr = s->inbuf; + s->frame_size = 0; + break; + } + + // 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; +} +#endif /* CONFIG_MPEGAUDIO_PARSER */ + +#if defined(CONFIG_AC3_PARSER) || defined(CONFIG_AAC_PARSER) +/* 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 + +#ifdef CONFIG_AC3_PARSER +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 +}; +#endif /* CONFIG_AC3_PARSER */ + +#ifdef CONFIG_AAC_PARSER +static const int aac_sample_rates[16] = { + 96000, 88200, 64000, 48000, 44100, 32000, + 24000, 22050, 16000, 12000, 11025, 8000, 7350 +}; + +static const int aac_channels[8] = { + 0, 1, 2, 3, 4, 5, 6, 8 +}; +#endif + +#ifdef CONFIG_AC3_PARSER +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; +} +#endif /* CONFIG_AC3_PARSER */ + +#ifdef CONFIG_AAC_PARSER +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; +} +#endif /* CONFIG_AAC_PARSER */ + +#ifdef CONFIG_AC3_PARSER +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; +} +#endif + +#ifdef CONFIG_AAC_PARSER +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; +} +#endif + +/* 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; +} +#endif /* CONFIG_AC3_PARSER || CONFIG_AAC_PARSER */ + +#ifdef CONFIG_MPEG4VIDEO_PARSER +AVCodecParser mpeg4video_parser = { + { CODEC_ID_MPEG4 }, + sizeof(ParseContext1), + mpeg4video_parse_init, + mpeg4video_parse, + ff_parse1_close, + ff_mpeg4video_split, +}; +#endif +#ifdef CONFIG_MPEGAUDIO_PARSER +AVCodecParser mpegaudio_parser = { + { CODEC_ID_MP2, CODEC_ID_MP3 }, + sizeof(MpegAudioParseContext), + mpegaudio_parse_init, + mpegaudio_parse, + NULL, +}; +#endif +#ifdef CONFIG_AC3_PARSER +AVCodecParser ac3_parser = { + { CODEC_ID_AC3 }, + sizeof(AC3ParseContext), + ac3_parse_init, + ac3_parse, + NULL, +}; +#endif +#ifdef CONFIG_AAC_PARSER +AVCodecParser aac_parser = { + { CODEC_ID_AAC }, + sizeof(AC3ParseContext), + aac_parse_init, + ac3_parse, + NULL, +}; +#endif |