X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fac3_parser.c;h=970484810b4cc03e6f37e20535a35124850386a1;hb=380146924ecad2e05e9dcc5c3c2e1b5ba47c51e8;hp=7f0818b60764c4cf6cab77aff4e0f889bab833f8;hpb=6808a8eaf2796ac64df1a760e928664d32a994e2;p=ffmpeg diff --git a/libavcodec/ac3_parser.c b/libavcodec/ac3_parser.c index 7f0818b6076..970484810b4 100644 --- a/libavcodec/ac3_parser.c +++ b/libavcodec/ac3_parser.c @@ -1,29 +1,30 @@ /* - * AC3 parser - * Copyright (c) 2003 Fabrice Bellard. - * Copyright (c) 2003 Michael Niedermayer. + * AC-3 parser + * Copyright (c) 2003 Fabrice Bellard + * Copyright (c) 2003 Michael Niedermayer * - * This file is part of FFmpeg. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * 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 2.1 of the License, or (at your option) any later version. * - * FFmpeg 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 FFmpeg; if not, write to the Free Software + * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +#include "libavutil/channel_layout.h" #include "parser.h" #include "ac3_parser.h" #include "aac_ac3_parser.h" -#include "bitstream.h" +#include "get_bits.h" #define AC3_HEADER_SIZE 7 @@ -33,102 +34,129 @@ static const uint8_t eac3_blocks[4] = { 1, 2, 3, 6 }; +/** + * Table for center mix levels + * reference: Section 5.4.2.4 cmixlev + */ +static const uint8_t center_levels[4] = { 4, 5, 6, 5 }; + +/** + * Table for surround mix levels + * reference: Section 5.4.2.5 surmixlev + */ +static const uint8_t surround_levels[4] = { 4, 6, 7, 6 }; + -int ff_ac3_parse_header(const uint8_t buf[7], AC3HeaderInfo *hdr) +int avpriv_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr) { - GetBitContext gbc; int frame_size_code; - int num_blocks; memset(hdr, 0, sizeof(*hdr)); - init_get_bits(&gbc, buf, 54); - - hdr->sync_word = get_bits(&gbc, 16); + hdr->sync_word = get_bits(gbc, 16); if(hdr->sync_word != 0x0B77) - return AC3_PARSE_ERROR_SYNC; + return AAC_AC3_PARSE_ERROR_SYNC; /* read ahead to bsid to distinguish between AC-3 and E-AC-3 */ - hdr->bitstream_id = show_bits_long(&gbc, 29) & 0x1F; + hdr->bitstream_id = show_bits_long(gbc, 29) & 0x1F; if(hdr->bitstream_id > 16) - return AC3_PARSE_ERROR_BSID; + return AAC_AC3_PARSE_ERROR_BSID; + + hdr->num_blocks = 6; + + /* set default mix levels */ + hdr->center_mix_level = 5; // -4.5dB + hdr->surround_mix_level = 6; // -6.0dB + + /* set default dolby surround mode */ + hdr->dolby_surround_mode = AC3_DSURMOD_NOTINDICATED; if(hdr->bitstream_id <= 10) { /* Normal AC-3 */ - hdr->crc1 = get_bits(&gbc, 16); - hdr->sr_code = get_bits(&gbc, 2); + hdr->crc1 = get_bits(gbc, 16); + hdr->sr_code = get_bits(gbc, 2); if(hdr->sr_code == 3) - return AC3_PARSE_ERROR_SAMPLE_RATE; + return AAC_AC3_PARSE_ERROR_SAMPLE_RATE; - frame_size_code = get_bits(&gbc, 6); + frame_size_code = get_bits(gbc, 6); if(frame_size_code > 37) - return AC3_PARSE_ERROR_FRAME_SIZE; + return AAC_AC3_PARSE_ERROR_FRAME_SIZE; - skip_bits(&gbc, 5); // skip bsid, already got it + skip_bits(gbc, 5); // skip bsid, already got it + + hdr->bitstream_mode = get_bits(gbc, 3); + hdr->channel_mode = get_bits(gbc, 3); - skip_bits(&gbc, 3); // skip bitstream mode - hdr->channel_mode = get_bits(&gbc, 3); - if((hdr->channel_mode & 1) && hdr->channel_mode != AC3_CHMODE_MONO) { - skip_bits(&gbc, 2); // skip center mix level - } - if(hdr->channel_mode & 4) { - skip_bits(&gbc, 2); // skip surround mix level - } if(hdr->channel_mode == AC3_CHMODE_STEREO) { - skip_bits(&gbc, 2); // skip dolby surround mode + hdr->dolby_surround_mode = get_bits(gbc, 2); + } else { + if((hdr->channel_mode & 1) && hdr->channel_mode != AC3_CHMODE_MONO) + hdr-> center_mix_level = center_levels[get_bits(gbc, 2)]; + if(hdr->channel_mode & 4) + hdr->surround_mix_level = surround_levels[get_bits(gbc, 2)]; } - hdr->lfe_on = get_bits1(&gbc); + hdr->lfe_on = get_bits1(gbc); hdr->sr_shift = FFMAX(hdr->bitstream_id, 8) - 8; hdr->sample_rate = ff_ac3_sample_rate_tab[hdr->sr_code] >> hdr->sr_shift; hdr->bit_rate = (ff_ac3_bitrate_tab[frame_size_code>>1] * 1000) >> hdr->sr_shift; hdr->channels = ff_ac3_channels_tab[hdr->channel_mode] + hdr->lfe_on; hdr->frame_size = ff_ac3_frame_size_tab[frame_size_code][hdr->sr_code] * 2; - hdr->stream_type = EAC3_STREAM_TYPE_INDEPENDENT; + hdr->frame_type = EAC3_FRAME_TYPE_AC3_CONVERT; //EAC3_FRAME_TYPE_INDEPENDENT; + hdr->substreamid = 0; } else { /* Enhanced AC-3 */ hdr->crc1 = 0; - hdr->stream_type = get_bits(&gbc, 2); - if(hdr->stream_type == EAC3_STREAM_TYPE_RESERVED) - return AC3_PARSE_ERROR_STREAM_TYPE; + hdr->frame_type = get_bits(gbc, 2); + if(hdr->frame_type == EAC3_FRAME_TYPE_RESERVED) + return AAC_AC3_PARSE_ERROR_FRAME_TYPE; - skip_bits(&gbc, 3); // skip substream id + hdr->substreamid = get_bits(gbc, 3); - hdr->frame_size = (get_bits(&gbc, 11) + 1) << 1; + hdr->frame_size = (get_bits(gbc, 11) + 1) << 1; if(hdr->frame_size < AC3_HEADER_SIZE) - return AC3_PARSE_ERROR_FRAME_SIZE; + return AAC_AC3_PARSE_ERROR_FRAME_SIZE; - hdr->sr_code = get_bits(&gbc, 2); + hdr->sr_code = get_bits(gbc, 2); if (hdr->sr_code == 3) { - int sr_code2 = get_bits(&gbc, 2); + int sr_code2 = get_bits(gbc, 2); if(sr_code2 == 3) - return AC3_PARSE_ERROR_SAMPLE_RATE; + return AAC_AC3_PARSE_ERROR_SAMPLE_RATE; hdr->sample_rate = ff_ac3_sample_rate_tab[sr_code2] / 2; hdr->sr_shift = 1; - num_blocks = 6; } else { - num_blocks = eac3_blocks[get_bits(&gbc, 2)]; + hdr->num_blocks = eac3_blocks[get_bits(gbc, 2)]; hdr->sample_rate = ff_ac3_sample_rate_tab[hdr->sr_code]; hdr->sr_shift = 0; } - hdr->channel_mode = get_bits(&gbc, 3); - hdr->lfe_on = get_bits1(&gbc); + hdr->channel_mode = get_bits(gbc, 3); + hdr->lfe_on = get_bits1(gbc); hdr->bit_rate = (uint32_t)(8.0 * hdr->frame_size * hdr->sample_rate / - (num_blocks * 256.0)); + (hdr->num_blocks * 256.0)); hdr->channels = ff_ac3_channels_tab[hdr->channel_mode] + hdr->lfe_on; } + hdr->channel_layout = avpriv_ac3_channel_layout_tab[hdr->channel_mode]; + if (hdr->lfe_on) + hdr->channel_layout |= AV_CH_LOW_FREQUENCY; return 0; } -static int ac3_sync(AACAC3ParseContext *hdr_info) +static int ac3_sync(uint64_t state, AACAC3ParseContext *hdr_info, + int *need_next_header, int *new_frame_start) { int err; + union { + uint64_t u64; + uint8_t u8[8 + AV_INPUT_BUFFER_PADDING_SIZE]; + } tmp = { av_be2ne64(state) }; AC3HeaderInfo hdr; + GetBitContext gbc; - err = ff_ac3_parse_header(hdr_info->inbuf, &hdr); + init_get_bits(&gbc, tmp.u8+8-AC3_HEADER_SIZE, 54); + err = avpriv_ac3_parse_header(&gbc, &hdr); if(err < 0) return 0; @@ -136,24 +164,34 @@ static int ac3_sync(AACAC3ParseContext *hdr_info) hdr_info->sample_rate = hdr.sample_rate; hdr_info->bit_rate = hdr.bit_rate; hdr_info->channels = hdr.channels; - hdr_info->samples = AC3_FRAME_SIZE; + hdr_info->channel_layout = hdr.channel_layout; + hdr_info->samples = hdr.num_blocks * 256; + hdr_info->service_type = hdr.bitstream_mode; + if (hdr.bitstream_mode == 0x7 && hdr.channels > 1) + hdr_info->service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE; + if(hdr.bitstream_id>10) + hdr_info->codec_id = AV_CODEC_ID_EAC3; + else if (hdr_info->codec_id == AV_CODEC_ID_NONE) + hdr_info->codec_id = AV_CODEC_ID_AC3; + + *need_next_header = (hdr.frame_type != EAC3_FRAME_TYPE_AC3_CONVERT); + *new_frame_start = (hdr.frame_type != EAC3_FRAME_TYPE_DEPENDENT); return hdr.frame_size; } static av_cold int ac3_parse_init(AVCodecParserContext *s1) { AACAC3ParseContext *s = s1->priv_data; - s->inbuf_ptr = s->inbuf; s->header_size = AC3_HEADER_SIZE; s->sync = ac3_sync; return 0; } -AVCodecParser ac3_parser = { - { CODEC_ID_AC3 }, - sizeof(AACAC3ParseContext), - ac3_parse_init, - ff_aac_ac3_parse, - NULL, +AVCodecParser ff_ac3_parser = { + .codec_ids = { AV_CODEC_ID_AC3, AV_CODEC_ID_EAC3 }, + .priv_data_size = sizeof(AACAC3ParseContext), + .parser_init = ac3_parse_init, + .parser_parse = ff_aac_ac3_parse, + .parser_close = ff_parse_close, };