From 8424cf505c2b7bb6f26addcc3fe1e8dbfa17df1d Mon Sep 17 00:00:00 2001 From: Fabrice Bellard Date: Mon, 10 Nov 2003 15:29:20 +0000 Subject: [PATCH] new audio/video parser API Originally committed as revision 2492 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/Makefile | 2 +- libavcodec/allcodecs.c | 11 + libavcodec/avcodec.h | 46 ++- libavcodec/parser.c | 892 +++++++++++++++++++++++++++++++++++++++++ 4 files changed, 949 insertions(+), 2 deletions(-) create mode 100644 libavcodec/parser.c diff --git a/libavcodec/Makefile b/libavcodec/Makefile index 7fdbd0d7a4..6271aa3ca9 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -19,7 +19,7 @@ OBJS= common.o utils.o mem.o allcodecs.o \ vp3.o asv1.o 4xm.o cabac.o ffv1.o ra144.o ra288.o vcr1.o cljr.o \ roqvideo.o dpcm.o interplayvideo.o xan.o rpza.o cinepak.o msrle.o \ msvideo1.o vqavideo.o idcinvideo.o adx.o rational.o faandct.o 8bps.o \ - smc.o + smc.o parser.o ifeq ($(AMR_NB),yes) ifeq ($(AMR_NB_FIXED),yes) diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c index 20a9f364a4..46cd560904 100644 --- a/libavcodec/allcodecs.c +++ b/libavcodec/allcodecs.c @@ -193,5 +193,16 @@ PCM_CODEC(CODEC_ID_ADPCM_XA, adpcm_xa); PCM_CODEC(CODEC_ID_ADPCM_ADX, adpcm_adx); #undef PCM_CODEC + + /* parsers */ + av_register_codec_parser(&mpegvideo_parser); + av_register_codec_parser(&mpeg4video_parser); + av_register_codec_parser(&h263_parser); + av_register_codec_parser(&h264_parser); + + av_register_codec_parser(&mpegaudio_parser); +#ifdef CONFIG_AC3 + av_register_codec_parser(&ac3_parser); +#endif } diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h index 0a698bd054..6bcb3111da 100644 --- a/libavcodec/avcodec.h +++ b/libavcodec/avcodec.h @@ -16,7 +16,7 @@ extern "C" { #define FFMPEG_VERSION_INT 0x000408 #define FFMPEG_VERSION "0.4.8" -#define LIBAVCODEC_BUILD 4691 +#define LIBAVCODEC_BUILD 4692 #define LIBAVCODEC_VERSION_INT FFMPEG_VERSION_INT #define LIBAVCODEC_VERSION FFMPEG_VERSION @@ -1839,6 +1839,50 @@ typedef enum { */ int avcodec(void* handle, avc_cmd_t cmd, void* pin, void* pout); +/* frame parsing */ +typedef struct AVCodecParserContext { + void *priv_data; + struct AVCodecParser *parser; + int64_t frame_offset; /* offset of the current frame */ + int64_t cur_offset; /* current offset + (incremented by each av_parser_parse()) */ + int64_t last_frame_offset; /* offset of the last frame */ + /* video info */ + int pict_type; /* XXX: put it back in AVCodecContext */ + int repeat_pict; /* XXX: put it back in AVCodecContext */ + int64_t pts; /* in us, if given by the codec (used by raw mpeg4) */ + int64_t dts; /* in us, if given by the codec (used by raw mpeg4) */ +} AVCodecParserContext; + +typedef struct AVCodecParser { + int codec_ids[3]; /* several codec IDs are permitted */ + int priv_data_size; + int (*parser_init)(AVCodecParserContext *s); + int (*parser_parse)(AVCodecParserContext *s, + AVCodecContext *avctx, + uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size); + void (*parser_close)(AVCodecParserContext *s); + struct AVCodecParser *next; +} AVCodecParser; + +extern AVCodecParser *av_first_parser; + +void av_register_codec_parser(AVCodecParser *parser); +AVCodecParserContext *av_parser_init(int codec_id); +int av_parser_parse(AVCodecParserContext *s, + AVCodecContext *avctx, + uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size); +void av_parser_close(AVCodecParserContext *s); + +extern AVCodecParser mpegvideo_parser; +extern AVCodecParser mpeg4video_parser; +extern AVCodecParser h263_parser; +extern AVCodecParser h264_parser; +extern AVCodecParser mpegaudio_parser; +extern AVCodecParser ac3_parser; + /* memory */ void *av_malloc(unsigned int size); void *av_mallocz(unsigned int size); diff --git a/libavcodec/parser.c b/libavcodec/parser.c new file mode 100644 index 0000000000..e332d7de17 --- /dev/null +++ b/libavcodec/parser.c @@ -0,0 +1,892 @@ +/* + * Audio and Video frame extraction + * Copyright (c) 2003 Fabrice Bellard. + * Copyright (c) 2003 Michael Niedermayer. + * + * This library 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 of the License, or (at your option) any later version. + * + * This library 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 this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include "avcodec.h" +#include "mpegvideo.h" +#include "mpegaudio.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; + + 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) + 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; + } + } + return s; +} + +int av_parser_parse(AVCodecParserContext *s, + AVCodecContext *avctx, + uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size) +{ + int index; + /* WARNING: the returned index can be negative */ + index = s->parser->parser_parse(s, avctx, poutbuf, poutbuf_size, buf, buf_size); + /* update the file pointer */ + if (*poutbuf_size) { + s->frame_offset = s->last_frame_offset; + s->last_frame_offset = s->cur_offset + index; + } + if (index < 0) + index = 0; + s->cur_offset += index; + return index; +} + +void av_parser_close(AVCodecParserContext *s) +{ + if (s->parser->parser_close) + s->parser->parser_close(s); + av_free(s->priv_data); + av_free(s); +} + +/*****************************************************/ + +//#define END_NOT_FOUND (-100) + +#define PICTURE_START_CODE 0x00000100 +#define SEQ_START_CODE 0x000001b3 +#define EXT_START_CODE 0x000001b5 +#define SLICE_MIN_START_CODE 0x00000101 +#define SLICE_MAX_START_CODE 0x000001af + +typedef struct ParseContext1{ + uint8_t *buffer; + int index; + int last_index; + int buffer_size; + uint32_t state; ///< contains the last few bytes in MSB order + int frame_start_found; + int overread; ///< the number of bytes which where irreversibly read from the next frame + int overread_index; ///< the index into ParseContext1.buffer of the overreaded bytes + + /* MPEG2 specific */ + int frame_rate; + int progressive_sequence; + int width, height; + /* XXX: suppress that, needed by MPEG4 */ + MpegEncContext *enc; +} ParseContext1; + +/** + * combines the (truncated) bitstream to a complete frame + * @returns -1 if no complete frame could be created + */ +static int ff_combine_frame1(ParseContext1 *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++]; + } + + 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; +} + +/** + * finds the end of the current frame in the bitstream. + * @return the position of the first byte of the next frame, or -1 + */ +static int mpeg1_find_frame_end(ParseContext1 *pc, const uint8_t *buf, int buf_size) +{ + int i; + uint32_t state; + + state= pc->state; + + i=0; + if(!pc->frame_start_found){ + for(i=0; i= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){ + i++; + pc->frame_start_found=1; + break; + } + } + } + + if(pc->frame_start_found){ + for(; i SLICE_MAX_START_CODE){ + pc->frame_start_found=0; + pc->state=-1; + return i-3; + } + } + } + } + pc->state= state; + return END_NOT_FOUND; +} + +static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end) +{ + const uint8_t *buf_ptr; + unsigned int state=0xFFFFFFFF, v; + int val; + + buf_ptr = *pbuf_ptr; + while (buf_ptr < buf_end) { + v = *buf_ptr++; + if (state == 0x000001) { + state = ((state << 8) | v) & 0xffffff; + val = state; + goto found; + } + state = ((state << 8) | v) & 0xffffff; + } + val = -1; + found: + *pbuf_ptr = buf_ptr; + return val; +} + +/* XXX: merge with libavcodec ? */ +#define MPEG1_FRAME_RATE_BASE 1001 + +static const int frame_rate_tab[16] = { + 0, + 24000, + 24024, + 25025, + 30000, + 30030, + 50050, + 60000, + 60060, + // Xing's 15fps: (9) + 15015, + // libmpeg3's "Unofficial economy rates": (10-13) + 5005, + 10010, + 12012, + 15015, + // random, just to avoid segfault !never encode these + 25025, + 25025, +}; + +static void mpegvideo_extract_headers(AVCodecParserContext *s, + AVCodecContext *avctx, + const uint8_t *buf, int buf_size) +{ + ParseContext1 *pc = s->priv_data; + const uint8_t *buf_end; + int32_t start_code; + int frame_rate_index, ext_type, bytes_left; + int frame_rate_ext_n, frame_rate_ext_d; + int top_field_first, repeat_first_field, progressive_frame; + int horiz_size_ext, vert_size_ext; + + s->repeat_pict = 0; + buf_end = buf + buf_size; + while (buf < buf_end) { + start_code = find_start_code(&buf, buf_end); + bytes_left = buf_end - buf; + switch(start_code) { + case PICTURE_START_CODE: + if (bytes_left >= 2) { + s->pict_type = (buf[1] >> 3) & 7; + } + break; + case SEQ_START_CODE: + if (bytes_left >= 4) { + pc->width = avctx->width = (buf[0] << 4) | (buf[1] >> 4); + pc->height = avctx->height = ((buf[1] & 0x0f) << 8) | buf[2]; + frame_rate_index = buf[3] & 0xf; + pc->frame_rate = avctx->frame_rate = frame_rate_tab[frame_rate_index]; + avctx->frame_rate_base = MPEG1_FRAME_RATE_BASE; + } + break; + case EXT_START_CODE: + if (bytes_left >= 1) { + ext_type = (buf[0] >> 4); + switch(ext_type) { + case 0x1: /* sequence extension */ + if (bytes_left >= 6) { + horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7); + vert_size_ext = (buf[2] >> 5) & 3; + frame_rate_ext_n = (buf[5] >> 5) & 3; + frame_rate_ext_d = (buf[5] & 0x1f); + pc->progressive_sequence = buf[1] & (1 << 3); + + avctx->width = pc->width | (horiz_size_ext << 12); + avctx->height = pc->height | (vert_size_ext << 12); + avctx->frame_rate = pc->frame_rate * (frame_rate_ext_n + 1); + avctx->frame_rate_base = MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d + 1); + avctx->sub_id = 2; /* forces MPEG2 */ + } + break; + case 0x8: /* picture coding extension */ + if (bytes_left >= 5) { + top_field_first = buf[3] & (1 << 7); + repeat_first_field = buf[3] & (1 << 1); + progressive_frame = buf[4] & (1 << 7); + + /* check if we must repeat the frame */ + if (repeat_first_field) { + if (pc->progressive_sequence) { + if (top_field_first) + s->repeat_pict = 4; + else + s->repeat_pict = 2; + } else if (progressive_frame) { + s->repeat_pict = 1; + } + } + } + break; + } + } + break; + case -1: + goto the_end; + default: + /* we stop parsing when we encounter a slice. It ensures + that this function takes a negligible amount of time */ + if (start_code >= SLICE_MIN_START_CODE && + start_code <= SLICE_MAX_START_CODE) + goto the_end; + break; + } + } + the_end: ; +} + +static int mpegvideo_parse(AVCodecParserContext *s, + AVCodecContext *avctx, + uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size) +{ + ParseContext1 *pc = s->priv_data; + int next; + + next= mpeg1_find_frame_end(pc, buf, buf_size); + + if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) { + *poutbuf = NULL; + *poutbuf_size = 0; + return buf_size; + } + /* we have a full frame : we just parse the first few MPEG headers + to have the full timing information. The time take by this + function should be negligible for uncorrupted streams */ + mpegvideo_extract_headers(s, avctx, buf, buf_size); +#if 0 + printf("pict_type=%d frame_rate=%0.3f repeat_pict=%d\n", + s->pict_type, (double)avctx->frame_rate / avctx->frame_rate_base, s->repeat_pict); +#endif + + *poutbuf = (uint8_t *)buf; + *poutbuf_size = buf_size; + return next; +} + +static void mpegvideo_parse_close(AVCodecParserContext *s) +{ + ParseContext1 *pc = s->priv_data; + + av_free(pc->buffer); + av_free(pc->enc); +} + +/*************************/ + +/** + * finds the end of the current frame in the bitstream. + * @return the position of the first byte of the next frame, or -1 + */ +static int mpeg4_find_frame_end(ParseContext1 *pc, + const uint8_t *buf, int buf_size) +{ + int vop_found, i; + uint32_t state; + + vop_found= pc->frame_start_found; + state= pc->state; + + i=0; + if(!vop_found){ + for(i=0; iframe_start_found=0; + pc->state=-1; + return i-3; + } + } + } + pc->frame_start_found= vop_found; + pc->state= state; + return END_NOT_FOUND; +} + +/* 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; + init_get_bits(gb, buf, 8 * buf_size); + ret = ff_mpeg4_decode_picture_header(s, gb); + if (s->width) { + avctx->width = s->width; + avctx->height = s->height; + } + return ret; +} + +int mpeg4video_parse_init(AVCodecParserContext *s) +{ + ParseContext1 *pc = s->priv_data; + pc->enc = av_mallocz(sizeof(MpegEncContext)); + if (!pc->enc) + return -1; + return 0; +} + +static int mpeg4video_parse(AVCodecParserContext *s, + AVCodecContext *avctx, + uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size) +{ + ParseContext1 *pc = s->priv_data; + int next; + + next= mpeg4_find_frame_end(pc, buf, buf_size); + + if (ff_combine_frame1(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; +} + +/*************************/ + +static int h263_find_frame_end(ParseContext1 *pc, const uint8_t *buf, int buf_size) +{ + int vop_found, i; + uint32_t state; + + vop_found= pc->frame_start_found; + state= pc->state; + + i=0; + if(!vop_found){ + for(i=0; i>(32-22) == 0x20){ + i++; + vop_found=1; + break; + } + } + } + + if(vop_found){ + for(; i>(32-22) == 0x20){ + pc->frame_start_found=0; + pc->state=-1; + return i-3; + } + } + } + pc->frame_start_found= vop_found; + pc->state= state; + + return END_NOT_FOUND; +} + +static int h263_parse(AVCodecParserContext *s, + AVCodecContext *avctx, + uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size) +{ + ParseContext1 *pc = s->priv_data; + int next; + + next= h263_find_frame_end(pc, buf, buf_size); + + if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) { + *poutbuf = NULL; + *poutbuf_size = 0; + return buf_size; + } + + *poutbuf = (uint8_t *)buf; + *poutbuf_size = buf_size; + return next; +} + +/*************************/ + +/** + * finds the end of the current frame in the bitstream. + * @return the position of the first byte of the next frame, or -1 + */ +static int h264_find_frame_end(ParseContext1 *pc, const uint8_t *buf, int buf_size) +{ + int i; + uint32_t state; +//printf("first %02X%02X%02X%02X\n", buf[0], buf[1],buf[2],buf[3]); +// mb_addr= pc->mb_addr - 1; + state= pc->state; + //FIXME this will fail with slices + for(i=0; iframe_start_found){ + pc->state=-1; + pc->frame_start_found= 0; + return i-3; + } + pc->frame_start_found= 1; + } + } + + pc->state= state; + return END_NOT_FOUND; +} + +static int h264_parse(AVCodecParserContext *s, + AVCodecContext *avctx, + uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size) +{ + ParseContext1 *pc = s->priv_data; + int next; + + next= h264_find_frame_end(pc, buf, buf_size); + + if (ff_combine_frame1(pc, next, (uint8_t **)&buf, &buf_size) < 0) { + *poutbuf = NULL; + *poutbuf_size = 0; + return buf_size; + } + + *poutbuf = (uint8_t *)buf; + *poutbuf_size = buf_size; + return next; +} + +/*************************/ + +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; +} MpegAudioParseContext; + +#define MPA_HEADER_SIZE 4 + +/* header + layer + bitrate + freq + lsf/mpeg25 */ +#define SAME_HEADER_MASK \ + (0xffe00000 | (3 << 17) | (0xf << 12) | (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; + 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: + 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) { + /* 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 { + s->frame_size = ret; +#if 0 + /* free format: prepare to compute frame size */ + if (decode_header(s, header) == 1) { + s->frame_size = -1; + } +#endif + } + } + } 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) { + *poutbuf = s->inbuf; + *poutbuf_size = s->inbuf_ptr - s->inbuf; + s->inbuf_ptr = s->inbuf; + s->frame_size = 0; + break; + } + } + return buf_ptr - buf; +} + +#ifdef CONFIG_AC3 +extern int a52_syncinfo (const uint8_t * buf, int * flags, + int * sample_rate, int * bit_rate); + +typedef struct AC3ParseContext { + uint8_t inbuf[4096]; /* input buffer */ + uint8_t *inbuf_ptr; + int frame_size; + int flags; +} AC3ParseContext; + +#define AC3_HEADER_SIZE 7 +#define A52_LFE 16 + +static int ac3_parse_init(AVCodecParserContext *s1) +{ + AC3ParseContext *s = s1->priv_data; + s->inbuf_ptr = s->inbuf; + return 0; +} + +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; + static const int ac3_channels[8] = { + 2, 1, 2, 3, 3, 4, 4, 5 + }; + + *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 7 bytes to parse it */ + len = AC3_HEADER_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; + if ((s->inbuf_ptr - s->inbuf) == AC3_HEADER_SIZE) { + len = a52_syncinfo(s->inbuf, &s->flags, &sample_rate, &bit_rate); + if (len == 0) { + /* no sync found : move by one byte (inefficient, but simple!) */ + memmove(s->inbuf, s->inbuf + 1, AC3_HEADER_SIZE - 1); + s->inbuf_ptr--; + } else { + s->frame_size = len; + /* update codec info */ + avctx->sample_rate = sample_rate; + avctx->channels = ac3_channels[s->flags & 7]; + if (s->flags & A52_LFE) + avctx->channels++; + avctx->bit_rate = bit_rate; + avctx->frame_size = 6 * 256; + } + } + } else if (len < s->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; + } else { + *poutbuf = s->inbuf; + *poutbuf_size = s->frame_size; + s->inbuf_ptr = s->inbuf; + s->frame_size = 0; + break; + } + } + return buf_ptr - buf; +} +#endif + +AVCodecParser mpegvideo_parser = { + { CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO }, + sizeof(ParseContext1), + NULL, + mpegvideo_parse, + mpegvideo_parse_close, +}; + +AVCodecParser mpeg4video_parser = { + { CODEC_ID_MPEG4 }, + sizeof(ParseContext1), + mpeg4video_parse_init, + mpeg4video_parse, + mpegvideo_parse_close, +}; + +AVCodecParser h263_parser = { + { CODEC_ID_H263 }, + sizeof(ParseContext1), + NULL, + h263_parse, + mpegvideo_parse_close, +}; + +AVCodecParser h264_parser = { + { CODEC_ID_H264 }, + sizeof(ParseContext1), + NULL, + h264_parse, + mpegvideo_parse_close, +}; + +AVCodecParser mpegaudio_parser = { + { CODEC_ID_MP2, CODEC_ID_MP3 }, + sizeof(MpegAudioParseContext), + mpegaudio_parse_init, + mpegaudio_parse, + NULL, +}; + +#ifdef CONFIG_AC3 +AVCodecParser ac3_parser = { + { CODEC_ID_AC3 }, + sizeof(AC3ParseContext), + ac3_parse_init, + ac3_parse, + NULL, +}; +#endif