X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fparser.c;h=9fd7af6ce6453f7c2eb24de2852f792ec4592ae9;hb=0249144a1c5ca6054e4b7374b5dd24bcbe435239;hp=60f55758ffe26ba870f3df25f9130e9eb2616f28;hpb=7984bbe2ce445b7b550205361e781adfea2db473;p=ffmpeg diff --git a/libavcodec/parser.c b/libavcodec/parser.c index 60f55758ffe..9fd7af6ce64 100644 --- a/libavcodec/parser.c +++ b/libavcodec/parser.c @@ -1,27 +1,33 @@ /* * 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 library is free software; you can redistribute it and/or + * This file is part of Libav. + * + * Libav 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. + * version 2.1 of the License, or (at your option) any later version. * - * This library is distributed in the hope that it will be useful, + * Libav 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 + * License along with Libav; 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" -AVCodecParser *av_first_parser = NULL; +#include "parser.h" + +static AVCodecParser *av_first_parser = NULL; + +AVCodecParser* av_parser_next(AVCodecParser *p){ + if(p) return p->next; + else return av_first_parser; +} void av_register_codec_parser(AVCodecParser *parser) { @@ -35,6 +41,9 @@ AVCodecParserContext *av_parser_init(int codec_id) 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 || @@ -49,10 +58,12 @@ AVCodecParserContext *av_parser_init(int codec_id) 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->priv_data_size) { + 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); @@ -63,75 +74,90 @@ AVCodecParserContext *av_parser_init(int codec_id) } } s->fetch_timestamp=1; + s->pict_type = AV_PICTURE_TYPE_I; + s->key_frame = -1; + s->convergence_duration = 0; + s->dts_sync_point = INT_MIN; + s->dts_ref_dts_delta = INT_MIN; + s->pts_dts_delta = INT_MIN; return s; } -/* NOTE: buf_size == 0 is used to signal EOF so that the last frame - can be returned if necessary */ -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) +void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove){ + int i; + + s->dts= s->pts= AV_NOPTS_VALUE; + s->pos= -1; + s->offset= 0; + for(i = 0; i < AV_PARSER_PTS_NB; i++) { + if ( s->cur_offset + off >= s->cur_frame_offset[i] + && (s->frame_offset < s->cur_frame_offset[i] || + (!s->frame_offset && !s->next_frame_offset)) // first field/frame + //check is disabled because mpeg-ts doesnt send complete PES packets + && /*s->next_frame_offset + off <*/ s->cur_frame_end[i]){ + s->dts= s->cur_frame_dts[i]; + s->pts= s->cur_frame_pts[i]; + s->pos= s->cur_frame_pos[i]; + s->offset = s->next_frame_offset - s->cur_frame_offset[i]; + if(remove) + s->cur_frame_offset[i]= INT64_MAX; + if(s->cur_offset + off < s->cur_frame_end[i]) + break; + } + } +} + +int av_parser_parse2(AVCodecParserContext *s, + AVCodecContext *avctx, + uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size, + int64_t pts, int64_t dts, + int64_t pos) { - int index, i, k; + int index, i; uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE]; - + + if(!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) { + s->next_frame_offset = + s->cur_offset = pos; + s->flags |= PARSER_FLAG_FETCHED_OFFSET; + } + 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 { + } else if (s->cur_offset + buf_size != + s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */ /* 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; - } + i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1); + s->cur_frame_start_index = i; + s->cur_frame_offset[i] = s->cur_offset; + s->cur_frame_end[i] = s->cur_offset + buf_size; + s->cur_frame_pts[i] = pts; + s->cur_frame_dts[i] = dts; + s->cur_frame_pos[i] = pos; + } + + if (s->fetch_timestamp){ + s->fetch_timestamp=0; + s->last_pts = s->pts; + s->last_dts = s->dts; + s->last_pos = s->pos; + ff_fetch_timestamp(s, 0, 0); } /* 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:%lld, %lld, out:%lld, %lld, in:%d out:%d id:%d\n", pts, dts, s->last_pts, s->last_dts, buf_size, *poutbuf_size, avctx->codec_id); + index = s->parser->parser_parse(s, avctx, (const uint8_t **)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->frame_offset = s->next_frame_offset; - 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; - } + /* offset of the next frame */ + s->next_frame_offset = s->cur_offset + index; + s->fetch_timestamp=1; } if (index < 0) index = 0; @@ -139,51 +165,69 @@ int av_parser_parse(AVCodecParserContext *s, 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 != AV_PICTURE_TYPE_I && (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); + if(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{ - ParseContext pc; -/* XXX/FIXME PC1 vs. PC */ - /* MPEG2 specific */ - int frame_rate; - int progressive_sequence; - int width, height; - - /* XXX: suppress that, needed by MPEG4 */ - MpegEncContext *enc; - int first_picture; -} ParseContext1; - /** - * combines the (truncated) bitstream to a complete frame - * @returns -1 if no complete frame could be created + * Combine the (truncated) bitstream to a complete frame. + * @return -1 if no complete frame could be created, AVERROR(ENOMEM) if there was a memory allocation error */ -int ff_combine_frame(ParseContext *pc, int next, uint8_t **buf, int *buf_size) +int ff_combine_frame(ParseContext *pc, int next, const 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]); + av_dlog(pc, "overread %d, state:%X next:%d index:%d o_index:%d\n", + pc->overread, pc->state, next, pc->index, pc->overread_index); + av_dlog(pc, "%X %X %X %X\n", (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]); } -#endif - /* copy overreaded bytes from last frame into buffer */ + /* Copy overread bytes from last frame into buffer. */ for(; pc->overread>0; pc->overread--){ pc->buffer[pc->index++]= pc->buffer[pc->overread_index++]; } @@ -197,8 +241,11 @@ int ff_combine_frame(ParseContext *pc, int next, uint8_t **buf, int *buf_size) /* 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); + void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, (*buf_size) + pc->index + FF_INPUT_BUFFER_PADDING_SIZE); + if(!new_buffer) + return AVERROR(ENOMEM); + pc->buffer = new_buffer; memcpy(&pc->buffer[pc->index], *buf, *buf_size); pc->index += *buf_size; return -1; @@ -206,11 +253,14 @@ int ff_combine_frame(ParseContext *pc, int next, uint8_t **buf, int *buf_size) *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); + void* new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size, next + pc->index + FF_INPUT_BUFFER_PADDING_SIZE); + if(!new_buffer) + return AVERROR(ENOMEM); + pc->buffer = new_buffer; memcpy(&pc->buffer[pc->index], *buf, next + FF_INPUT_BUFFER_PADDING_SIZE ); pc->index = 0; *buf= pc->buffer; @@ -219,203 +269,27 @@ int ff_combine_frame(ParseContext *pc, int next, uint8_t **buf, int *buf_size) /* store overread bytes */ for(;next < 0; next++){ pc->state = (pc->state<<8) | pc->buffer[pc->last_index + next]; + pc->state64 = (pc->state64<<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]); + av_dlog(pc, "overread %d, state:%X next:%d index:%d o_index:%d\n", + pc->overread, pc->state, next, pc->index, pc->overread_index); + av_dlog(pc, "%X %X %X %X\n", (*buf)[0], (*buf)[1],(*buf)[2],(*buf)[3]); } -#endif return 0; } -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 picture_structure, 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 = (buf[0] << 4) | (buf[1] >> 4); - pc->height = ((buf[1] & 0x0f) << 8) | buf[2]; - avcodec_set_dimensions(avctx, pc->width, pc->height); - 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; - avctx->codec_id = CODEC_ID_MPEG1VIDEO; - avctx->sub_id = 1; - } - 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->has_b_frames= buf[5] >> 7; - - pc->width |=(horiz_size_ext << 12); - pc->height |=( vert_size_ext << 12); - avcodec_set_dimensions(avctx, pc->width, pc->height); - 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->codec_id = CODEC_ID_MPEG2VIDEO; - avctx->sub_id = 2; /* forces MPEG2 */ - } - break; - case 0x8: /* picture coding extension */ - if (bytes_left >= 5) { - picture_structure = buf[2]&3; - 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; - } - } - - /* the packet only represents half a frame - XXX,FIXME maybe find a different solution */ - if(picture_structure != 3) - 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 *pc1 = s->priv_data; - ParseContext *pc= &pc1->pc; - int next; - - next= ff_mpeg1_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; - } - /* 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; -} - void ff_parse_close(AVCodecParserContext *s) { ParseContext *pc = s->priv_data; - av_free(pc->buffer); + av_freep(&pc->buffer); } -static void parse1_close(AVCodecParserContext *s) +void ff_parse1_close(AVCodecParserContext *s) { ParseContext1 *pc1 = s->priv_data; @@ -425,352 +299,16 @@ static void parse1_close(AVCodecParserContext *s) /*************************/ -/* 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); - } - 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, +int ff_mpeg4video_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { - ParseContext *pc = s->priv_data; - int next; - - 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; -} - -/*************************/ - -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; + int i; + uint32_t state= -1; -#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; - } + for(i=0; ipriv_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; - /* set channels,except if the user explicitly requests 1 or 2 channels, XXX/FIXME this is a bit ugly */ - if(avctx->channels!=1 && avctx->channels!=2){ - 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, - parse1_close, -}; - -AVCodecParser mpeg4video_parser = { - { CODEC_ID_MPEG4 }, - sizeof(ParseContext1), - mpeg4video_parse_init, - mpeg4video_parse, - parse1_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