X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fmpegaudio_parser.c;h=6d7ab8a9c1e38e38f48fe230595db71c2978fb70;hb=11491503c492f3a3ce190e2ee8cec660d3b91e1d;hp=55d865f26694404893f82f5f6f10f8efe81d6463;hpb=a14d138cb8be8a32c5ed4fb4d8aecb2aa1232236;p=ffmpeg diff --git a/libavcodec/mpegaudio_parser.c b/libavcodec/mpegaudio_parser.c index 55d865f2669..6d7ab8a9c1e 100644 --- a/libavcodec/mpegaudio_parser.c +++ b/libavcodec/mpegaudio_parser.c @@ -1,7 +1,7 @@ /* * MPEG Audio parser - * 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. * @@ -26,11 +26,8 @@ typedef struct MpegAudioParseContext { - uint8_t inbuf[MPA_MAX_CODED_FRAME_SIZE]; /* input buffer */ - uint8_t *inbuf_ptr; + ParseContext pc; int frame_size; - int free_format_frame_size; - int free_format_next_header; uint32_t header; int header_count; } MpegAudioParseContext; @@ -46,8 +43,7 @@ typedef struct MpegAudioParseContext { header, otherwise the coded frame size in bytes */ int ff_mpa_decode_header(AVCodecContext *avctx, uint32_t head, int *sample_rate, int *channels, int *frame_size, int *bit_rate) { - MPADecodeContext s1, *s = &s1; - s1.avctx = avctx; + MPADecodeHeader s1, *s = &s1; if (ff_mpa_check_header(head) != 0) return -1; @@ -82,178 +78,72 @@ int ff_mpa_decode_header(AVCodecContext *avctx, uint32_t head, int *sample_rate, return s->frame_size; } -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, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size) { MpegAudioParseContext *s = s1->priv_data; - int len, ret, sr, channels, bit_rate, frame_size; - 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) { - AV_WB32(s->inbuf, s->free_format_next_header); - s->inbuf_ptr = s->inbuf + 4; - s->free_format_next_header = 0; - goto got_header; + ParseContext *pc = &s->pc; + uint32_t state= pc->state; + int i; + int next= END_NOT_FOUND; + + for(i=0; iframe_size){ + int inc= FFMIN(buf_size - i, s->frame_size); + i += inc; + s->frame_size -= inc; + + if(!s->frame_size){ + next= i; + break; } - /* 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 = AV_RB32(s->inbuf); + }else{ + while(iheader_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(avctx, "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) + if((state&SAME_HEADER_MASK) != (s->header&SAME_HEADER_MASK) && s->header) s->header_count= -3; - s->header= header; + s->header= state; s->header_count++; - s->frame_size = ret; + s->frame_size = ret-4; -#if 0 - /* free format: prepare to compute frame size */ - if (ff_mpegaudio_decode_header(s, header) == 1) { - s->frame_size = -1; - } -#endif if(s->header_count > 1){ avctx->sample_rate= sr; avctx->channels = channels; avctx->frame_size = frame_size; avctx->bit_rate = bit_rate; } + break; } } - } 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 = AV_RB32(p); - header1 = AV_RB32(s->inbuf); - /* 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(avctx, "free frame size=%d padding=%d\n", - s->free_format_frame_size, padding); - ff_mpegaudio_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; - } + pc->state= state; + if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { + *poutbuf = NULL; + *poutbuf_size = 0; + return buf_size; } - return buf_ptr - buf; + + *poutbuf = buf; + *poutbuf_size = buf_size; + return next; } AVCodecParser mpegaudio_parser = { { CODEC_ID_MP1, CODEC_ID_MP2, CODEC_ID_MP3 }, sizeof(MpegAudioParseContext), - mpegaudio_parse_init, - mpegaudio_parse, NULL, + mpegaudio_parse, + ff_parse_close, };