| /* |
| * RIFF muxing functions |
| * Copyright (c) 2000 Fabrice Bellard |
| * |
| * 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 "libavutil/dict.h" |
| #include "libavutil/log.h" |
| #include "libavutil/mathematics.h" |
| #include "libavcodec/avcodec.h" |
| #include "libavcodec/bytestream.h" |
| #include "avformat.h" |
| #include "avio_internal.h" |
| #include "riff.h" |
| |
| int64_t ff_start_tag(AVIOContext *pb, const char *tag) |
| { |
| ffio_wfourcc(pb, tag); |
| avio_wl32(pb, -1); |
| return avio_tell(pb); |
| } |
| |
| void ff_end_tag(AVIOContext *pb, int64_t start) |
| { |
| int64_t pos; |
| |
| av_assert0((start&1) == 0); |
| |
| pos = avio_tell(pb); |
| if (pos & 1) |
| avio_w8(pb, 0); |
| avio_seek(pb, start - 4, SEEK_SET); |
| avio_wl32(pb, (uint32_t)(pos - start)); |
| avio_seek(pb, FFALIGN(pos, 2), SEEK_SET); |
| } |
| |
| /* WAVEFORMATEX header */ |
| /* returns the size or -1 on error */ |
| int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc, int flags) |
| { |
| int bps, blkalign, bytespersec, frame_size; |
| int hdrsize; |
| int64_t hdrstart = avio_tell(pb); |
| int waveformatextensible; |
| uint8_t temp[256]; |
| uint8_t *riff_extradata = temp; |
| uint8_t *riff_extradata_start = temp; |
| |
| if (!enc->codec_tag || enc->codec_tag > 0xffff) |
| return -1; |
| |
| /* We use the known constant frame size for the codec if known, otherwise |
| * fall back on using AVCodecContext.frame_size, which is not as reliable |
| * for indicating packet duration. */ |
| frame_size = av_get_audio_frame_duration(enc, enc->block_align); |
| |
| waveformatextensible = (enc->channels > 2 && enc->channel_layout) || |
| enc->sample_rate > 48000 || |
| enc->codec_id == AV_CODEC_ID_EAC3 || |
| av_get_bits_per_sample(enc->codec_id) > 16; |
| |
| if (waveformatextensible) |
| avio_wl16(pb, 0xfffe); |
| else |
| avio_wl16(pb, enc->codec_tag); |
| |
| avio_wl16(pb, enc->channels); |
| avio_wl32(pb, enc->sample_rate); |
| if (enc->codec_id == AV_CODEC_ID_ATRAC3 || |
| enc->codec_id == AV_CODEC_ID_G723_1 || |
| enc->codec_id == AV_CODEC_ID_MP2 || |
| enc->codec_id == AV_CODEC_ID_MP3 || |
| enc->codec_id == AV_CODEC_ID_GSM_MS) { |
| bps = 0; |
| } else { |
| if (!(bps = av_get_bits_per_sample(enc->codec_id))) { |
| if (enc->bits_per_coded_sample) |
| bps = enc->bits_per_coded_sample; |
| else |
| bps = 16; // default to 16 |
| } |
| } |
| if (bps != enc->bits_per_coded_sample && enc->bits_per_coded_sample) { |
| av_log(enc, AV_LOG_WARNING, |
| "requested bits_per_coded_sample (%d) " |
| "and actually stored (%d) differ\n", |
| enc->bits_per_coded_sample, bps); |
| } |
| |
| if (enc->codec_id == AV_CODEC_ID_MP2) { |
| blkalign = (144 * enc->bit_rate - 1)/enc->sample_rate + 1; |
| } else if (enc->codec_id == AV_CODEC_ID_MP3) { |
| blkalign = 576 * (enc->sample_rate <= (24000 + 32000)/2 ? 1 : 2); |
| } else if (enc->codec_id == AV_CODEC_ID_AC3) { |
| blkalign = 3840; /* maximum bytes per frame */ |
| } else if (enc->codec_id == AV_CODEC_ID_AAC) { |
| blkalign = 768 * enc->channels; /* maximum bytes per frame */ |
| } else if (enc->codec_id == AV_CODEC_ID_G723_1) { |
| blkalign = 24; |
| } else if (enc->block_align != 0) { /* specified by the codec */ |
| blkalign = enc->block_align; |
| } else |
| blkalign = bps * enc->channels / av_gcd(8, bps); |
| if (enc->codec_id == AV_CODEC_ID_PCM_U8 || |
| enc->codec_id == AV_CODEC_ID_PCM_S24LE || |
| enc->codec_id == AV_CODEC_ID_PCM_S32LE || |
| enc->codec_id == AV_CODEC_ID_PCM_F32LE || |
| enc->codec_id == AV_CODEC_ID_PCM_F64LE || |
| enc->codec_id == AV_CODEC_ID_PCM_S16LE) { |
| bytespersec = enc->sample_rate * blkalign; |
| } else if (enc->codec_id == AV_CODEC_ID_G723_1) { |
| bytespersec = 800; |
| } else { |
| bytespersec = enc->bit_rate / 8; |
| } |
| avio_wl32(pb, bytespersec); /* bytes per second */ |
| avio_wl16(pb, blkalign); /* block align */ |
| avio_wl16(pb, bps); /* bits per sample */ |
| if (enc->codec_id == AV_CODEC_ID_MP3) { |
| bytestream_put_le16(&riff_extradata, 1); /* wID */ |
| bytestream_put_le32(&riff_extradata, 2); /* fdwFlags */ |
| bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */ |
| bytestream_put_le16(&riff_extradata, 1); /* nFramesPerBlock */ |
| bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */ |
| } else if (enc->codec_id == AV_CODEC_ID_MP2) { |
| /* fwHeadLayer */ |
| bytestream_put_le16(&riff_extradata, 2); |
| /* dwHeadBitrate */ |
| bytestream_put_le32(&riff_extradata, enc->bit_rate); |
| /* fwHeadMode */ |
| bytestream_put_le16(&riff_extradata, enc->channels == 2 ? 1 : 8); |
| /* fwHeadModeExt */ |
| bytestream_put_le16(&riff_extradata, 0); |
| /* wHeadEmphasis */ |
| bytestream_put_le16(&riff_extradata, 1); |
| /* fwHeadFlags */ |
| bytestream_put_le16(&riff_extradata, 16); |
| /* dwPTSLow */ |
| bytestream_put_le32(&riff_extradata, 0); |
| /* dwPTSHigh */ |
| bytestream_put_le32(&riff_extradata, 0); |
| } else if (enc->codec_id == AV_CODEC_ID_G723_1) { |
| bytestream_put_le32(&riff_extradata, 0x9ace0002); /* extradata needed for msacm g723.1 codec */ |
| bytestream_put_le32(&riff_extradata, 0xaea2f732); |
| bytestream_put_le16(&riff_extradata, 0xacde); |
| } else if (enc->codec_id == AV_CODEC_ID_GSM_MS || |
| enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) { |
| /* wSamplesPerBlock */ |
| bytestream_put_le16(&riff_extradata, frame_size); |
| } else if (enc->extradata_size) { |
| riff_extradata_start = enc->extradata; |
| riff_extradata = enc->extradata + enc->extradata_size; |
| } |
| /* write WAVEFORMATEXTENSIBLE extensions */ |
| if (waveformatextensible) { |
| int write_channel_mask = !(flags & FF_PUT_WAV_HEADER_SKIP_CHANNELMASK) && |
| (enc->strict_std_compliance < FF_COMPLIANCE_NORMAL || |
| enc->channel_layout < 0x40000); |
| /* 22 is WAVEFORMATEXTENSIBLE size */ |
| avio_wl16(pb, riff_extradata - riff_extradata_start + 22); |
| /* ValidBitsPerSample || SamplesPerBlock || Reserved */ |
| avio_wl16(pb, bps); |
| /* dwChannelMask */ |
| avio_wl32(pb, write_channel_mask ? enc->channel_layout : 0); |
| /* GUID + next 3 */ |
| if (enc->codec_id == AV_CODEC_ID_EAC3) { |
| ff_put_guid(pb, ff_get_codec_guid(enc->codec_id, ff_codec_wav_guids)); |
| } else { |
| avio_wl32(pb, enc->codec_tag); |
| avio_wl32(pb, 0x00100000); |
| avio_wl32(pb, 0xAA000080); |
| avio_wl32(pb, 0x719B3800); |
| } |
| } else if ((flags & FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX) || |
| enc->codec_tag != 0x0001 /* PCM */ || |
| riff_extradata - riff_extradata_start) { |
| /* WAVEFORMATEX */ |
| avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */ |
| } /* else PCMWAVEFORMAT */ |
| avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start); |
| hdrsize = avio_tell(pb) - hdrstart; |
| if (hdrsize & 1) { |
| hdrsize++; |
| avio_w8(pb, 0); |
| } |
| |
| return hdrsize; |
| } |
| |
| /* BITMAPINFOHEADER header */ |
| void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc, |
| const AVCodecTag *tags, int for_asf, int ignore_extradata) |
| { |
| int keep_height = enc->extradata_size >= 9 && |
| !memcmp(enc->extradata + enc->extradata_size - 9, "BottomUp", 9); |
| int extradata_size = enc->extradata_size - 9*keep_height; |
| |
| /* size */ |
| avio_wl32(pb, 40 + (ignore_extradata ? 0 :extradata_size)); |
| avio_wl32(pb, enc->width); |
| //We always store RGB TopDown |
| avio_wl32(pb, enc->codec_tag || keep_height ? enc->height : -enc->height); |
| /* planes */ |
| avio_wl16(pb, 1); |
| /* depth */ |
| avio_wl16(pb, enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24); |
| /* compression type */ |
| avio_wl32(pb, enc->codec_tag); |
| avio_wl32(pb, (enc->width * enc->height * (enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24)+7) / 8); |
| avio_wl32(pb, 0); |
| avio_wl32(pb, 0); |
| avio_wl32(pb, 0); |
| avio_wl32(pb, 0); |
| |
| if (!ignore_extradata) { |
| avio_write(pb, enc->extradata, extradata_size); |
| |
| if (!for_asf && extradata_size & 1) |
| avio_w8(pb, 0); |
| } |
| } |
| |
| void ff_parse_specific_params(AVStream *st, int *au_rate, |
| int *au_ssize, int *au_scale) |
| { |
| AVCodecContext *codec = st->codec; |
| int gcd; |
| int audio_frame_size; |
| |
| /* We use the known constant frame size for the codec if known, otherwise |
| * fall back on using AVCodecContext.frame_size, which is not as reliable |
| * for indicating packet duration. */ |
| audio_frame_size = av_get_audio_frame_duration(codec, 0); |
| if (!audio_frame_size) |
| audio_frame_size = codec->frame_size; |
| |
| *au_ssize = codec->block_align; |
| if (audio_frame_size && codec->sample_rate) { |
| *au_scale = audio_frame_size; |
| *au_rate = codec->sample_rate; |
| } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO || |
| codec->codec_type == AVMEDIA_TYPE_DATA || |
| codec->codec_type == AVMEDIA_TYPE_SUBTITLE) { |
| *au_scale = st->time_base.num; |
| *au_rate = st->time_base.den; |
| } else { |
| *au_scale = codec->block_align ? codec->block_align * 8 : 8; |
| *au_rate = codec->bit_rate ? codec->bit_rate : |
| 8 * codec->sample_rate; |
| } |
| gcd = av_gcd(*au_scale, *au_rate); |
| *au_scale /= gcd; |
| *au_rate /= gcd; |
| } |
| |
| void ff_riff_write_info_tag(AVIOContext *pb, const char *tag, const char *str) |
| { |
| size_t len = strlen(str); |
| if (len > 0 && len < UINT32_MAX) { |
| len++; |
| ffio_wfourcc(pb, tag); |
| avio_wl32(pb, len); |
| avio_put_str(pb, str); |
| if (len & 1) |
| avio_w8(pb, 0); |
| } |
| } |
| |
| static const char riff_tags[][5] = { |
| "IARL", "IART", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI", |
| "IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD", |
| "IPRT", "ITRK", "ISBJ", "ISFT", "ISHP", "ISMP", "ISRC", "ISRF", "ITCH", |
| { 0 } |
| }; |
| |
| static int riff_has_valid_tags(AVFormatContext *s) |
| { |
| int i; |
| |
| for (i = 0; *riff_tags[i]; i++) |
| if (av_dict_get(s->metadata, riff_tags[i], NULL, AV_DICT_MATCH_CASE)) |
| return 1; |
| |
| return 0; |
| } |
| |
| void ff_riff_write_info(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| int i; |
| int64_t list_pos; |
| AVDictionaryEntry *t = NULL; |
| |
| ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL); |
| |
| /* writing empty LIST is not nice and may cause problems */ |
| if (!riff_has_valid_tags(s)) |
| return; |
| |
| list_pos = ff_start_tag(pb, "LIST"); |
| ffio_wfourcc(pb, "INFO"); |
| for (i = 0; *riff_tags[i]; i++) |
| if ((t = av_dict_get(s->metadata, riff_tags[i], |
| NULL, AV_DICT_MATCH_CASE))) |
| ff_riff_write_info_tag(s->pb, t->key, t->value); |
| ff_end_tag(pb, list_pos); |
| } |
| |
| void ff_put_guid(AVIOContext *s, const ff_asf_guid *g) |
| { |
| av_assert0(sizeof(*g) == 16); |
| avio_write(s, *g, sizeof(*g)); |
| } |
| |
| const ff_asf_guid *ff_get_codec_guid(enum AVCodecID id, const AVCodecGuid *av_guid) |
| { |
| int i; |
| for (i = 0; av_guid[i].id != AV_CODEC_ID_NONE; i++) { |
| if (id == av_guid[i].id) |
| return &(av_guid[i].guid); |
| } |
| return NULL; |
| } |
