mirror of https://github.com/FFmpeg/FFmpeg.git
Diego Biurrun
12 years ago
parent
fcc455ff2e
commit
3dd5c95dee
4 changed files with 307 additions and 270 deletions
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/*
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* RIFF muxing functions |
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* Copyright (c) 2000 Fabrice Bellard |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/dict.h" |
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#include "libavutil/log.h" |
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#include "libavutil/mathematics.h" |
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#include "libavcodec/avcodec.h" |
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#include "libavcodec/bytestream.h" |
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#include "avformat.h" |
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#include "avio_internal.h" |
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#include "riff.h" |
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int64_t ff_start_tag(AVIOContext *pb, const char *tag) |
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{ |
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ffio_wfourcc(pb, tag); |
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avio_wl32(pb, 0); |
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return avio_tell(pb); |
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} |
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void ff_end_tag(AVIOContext *pb, int64_t start) |
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{ |
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int64_t pos; |
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pos = avio_tell(pb); |
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avio_seek(pb, start - 4, SEEK_SET); |
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avio_wl32(pb, (uint32_t)(pos - start)); |
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avio_seek(pb, pos, SEEK_SET); |
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} |
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/* WAVEFORMATEX header */ |
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/* returns the size or -1 on error */ |
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int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc) |
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{ |
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int bps, blkalign, bytespersec, frame_size; |
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int hdrsize = 18; |
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int waveformatextensible; |
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uint8_t temp[256]; |
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uint8_t *riff_extradata = temp; |
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uint8_t *riff_extradata_start = temp; |
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if (!enc->codec_tag || enc->codec_tag > 0xffff) |
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return -1; |
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/* We use the known constant frame size for the codec if known, otherwise
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* fall back on using AVCodecContext.frame_size, which is not as reliable |
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* for indicating packet duration. */ |
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frame_size = av_get_audio_frame_duration(enc, 0); |
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if (!frame_size) |
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frame_size = enc->frame_size; |
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waveformatextensible = (enc->channels > 2 && enc->channel_layout) || |
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enc->sample_rate > 48000 || |
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av_get_bits_per_sample(enc->codec_id) > 16; |
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if (waveformatextensible) |
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avio_wl16(pb, 0xfffe); |
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else |
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avio_wl16(pb, enc->codec_tag); |
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avio_wl16(pb, enc->channels); |
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avio_wl32(pb, enc->sample_rate); |
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if (enc->codec_id == AV_CODEC_ID_MP2 || |
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enc->codec_id == AV_CODEC_ID_MP3 || |
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enc->codec_id == AV_CODEC_ID_GSM_MS) { |
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bps = 0; |
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} else { |
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if (!(bps = av_get_bits_per_sample(enc->codec_id))) { |
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if (enc->bits_per_coded_sample) |
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bps = enc->bits_per_coded_sample; |
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else |
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bps = 16; // default to 16
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} |
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} |
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if (bps != enc->bits_per_coded_sample && enc->bits_per_coded_sample) { |
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av_log(enc, AV_LOG_WARNING, |
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"requested bits_per_coded_sample (%d) " |
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"and actually stored (%d) differ\n", |
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enc->bits_per_coded_sample, bps); |
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} |
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if (enc->codec_id == AV_CODEC_ID_MP2 || |
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enc->codec_id == AV_CODEC_ID_MP3) { |
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/* This is wrong, but it seems many demuxers do not work if this
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* is set correctly. */ |
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blkalign = frame_size; |
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// blkalign = 144 * enc->bit_rate/enc->sample_rate;
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} else if (enc->codec_id == AV_CODEC_ID_AC3) { |
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blkalign = 3840; /* maximum bytes per frame */ |
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} else if (enc->block_align != 0) { /* specified by the codec */ |
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blkalign = enc->block_align; |
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} else |
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blkalign = bps * enc->channels / av_gcd(8, bps); |
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if (enc->codec_id == AV_CODEC_ID_PCM_U8 || |
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enc->codec_id == AV_CODEC_ID_PCM_S24LE || |
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enc->codec_id == AV_CODEC_ID_PCM_S32LE || |
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enc->codec_id == AV_CODEC_ID_PCM_F32LE || |
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enc->codec_id == AV_CODEC_ID_PCM_F64LE || |
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enc->codec_id == AV_CODEC_ID_PCM_S16LE) { |
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bytespersec = enc->sample_rate * blkalign; |
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} else { |
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bytespersec = enc->bit_rate / 8; |
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} |
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avio_wl32(pb, bytespersec); /* bytes per second */ |
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avio_wl16(pb, blkalign); /* block align */ |
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avio_wl16(pb, bps); /* bits per sample */ |
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if (enc->codec_id == AV_CODEC_ID_MP3) { |
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hdrsize += 12; |
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bytestream_put_le16(&riff_extradata, 1); /* wID */ |
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bytestream_put_le32(&riff_extradata, 2); /* fdwFlags */ |
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bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */ |
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bytestream_put_le16(&riff_extradata, 1); /* nFramesPerBlock */ |
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bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */ |
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} else if (enc->codec_id == AV_CODEC_ID_MP2) { |
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hdrsize += 22; |
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/* fwHeadLayer */ |
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bytestream_put_le16(&riff_extradata, 2); |
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/* dwHeadBitrate */ |
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bytestream_put_le32(&riff_extradata, enc->bit_rate); |
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/* fwHeadMode */ |
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bytestream_put_le16(&riff_extradata, enc->channels == 2 ? 1 : 8); |
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/* fwHeadModeExt */ |
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bytestream_put_le16(&riff_extradata, 0); |
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/* wHeadEmphasis */ |
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bytestream_put_le16(&riff_extradata, 1); |
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/* fwHeadFlags */ |
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bytestream_put_le16(&riff_extradata, 16); |
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/* dwPTSLow */ |
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bytestream_put_le32(&riff_extradata, 0); |
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/* dwPTSHigh */ |
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bytestream_put_le32(&riff_extradata, 0); |
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} else if (enc->codec_id == AV_CODEC_ID_GSM_MS || |
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enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) { |
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hdrsize += 2; |
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/* wSamplesPerBlock */ |
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bytestream_put_le16(&riff_extradata, frame_size); |
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} else if (enc->extradata_size) { |
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riff_extradata_start = enc->extradata; |
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riff_extradata = enc->extradata + enc->extradata_size; |
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hdrsize += enc->extradata_size; |
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} |
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/* write WAVEFORMATEXTENSIBLE extensions */ |
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if (waveformatextensible) { |
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hdrsize += 22; |
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/* 22 is WAVEFORMATEXTENSIBLE size */ |
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avio_wl16(pb, riff_extradata - riff_extradata_start + 22); |
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/* ValidBitsPerSample || SamplesPerBlock || Reserved */ |
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avio_wl16(pb, bps); |
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/* dwChannelMask */ |
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avio_wl32(pb, enc->channel_layout); |
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/* GUID + next 3 */ |
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avio_wl32(pb, enc->codec_tag); |
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avio_wl32(pb, 0x00100000); |
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avio_wl32(pb, 0xAA000080); |
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avio_wl32(pb, 0x719B3800); |
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} else { |
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avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */ |
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} |
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avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start); |
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if (hdrsize & 1) { |
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hdrsize++; |
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avio_w8(pb, 0); |
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} |
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return hdrsize; |
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} |
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/* BITMAPINFOHEADER header */ |
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void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc, |
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const AVCodecTag *tags, int for_asf) |
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{ |
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/* size */ |
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avio_wl32(pb, 40 + enc->extradata_size); |
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avio_wl32(pb, enc->width); |
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//We always store RGB TopDown
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avio_wl32(pb, enc->codec_tag ? enc->height : -enc->height); |
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/* planes */ |
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avio_wl16(pb, 1); |
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/* depth */ |
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avio_wl16(pb, enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24); |
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/* compression type */ |
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avio_wl32(pb, enc->codec_tag); |
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avio_wl32(pb, enc->width * enc->height * 3); |
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avio_wl32(pb, 0); |
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avio_wl32(pb, 0); |
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avio_wl32(pb, 0); |
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avio_wl32(pb, 0); |
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avio_write(pb, enc->extradata, enc->extradata_size); |
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if (!for_asf && enc->extradata_size & 1) |
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avio_w8(pb, 0); |
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} |
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void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, |
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int *au_ssize, int *au_scale) |
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{ |
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int gcd; |
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int audio_frame_size; |
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/* We use the known constant frame size for the codec if known, otherwise
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* fall back on using AVCodecContext.frame_size, which is not as reliable |
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* for indicating packet duration. */ |
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audio_frame_size = av_get_audio_frame_duration(stream, 0); |
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if (!audio_frame_size) |
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audio_frame_size = stream->frame_size; |
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*au_ssize = stream->block_align; |
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if (audio_frame_size && stream->sample_rate) { |
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*au_scale = audio_frame_size; |
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*au_rate = stream->sample_rate; |
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} else if (stream->codec_type == AVMEDIA_TYPE_VIDEO || |
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stream->codec_type == AVMEDIA_TYPE_DATA || |
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stream->codec_type == AVMEDIA_TYPE_SUBTITLE) { |
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*au_scale = stream->time_base.num; |
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*au_rate = stream->time_base.den; |
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} else { |
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*au_scale = stream->block_align ? stream->block_align * 8 : 8; |
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*au_rate = stream->bit_rate ? stream->bit_rate : |
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8 * stream->sample_rate; |
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} |
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gcd = av_gcd(*au_scale, *au_rate); |
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*au_scale /= gcd; |
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*au_rate /= gcd; |
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} |
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void ff_riff_write_info_tag(AVIOContext *pb, const char *tag, const char *str) |
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{ |
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int len = strlen(str); |
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if (len > 0) { |
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len++; |
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ffio_wfourcc(pb, tag); |
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avio_wl32(pb, len); |
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avio_put_str(pb, str); |
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if (len & 1) |
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avio_w8(pb, 0); |
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} |
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} |
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static const char riff_tags[][5] = { |
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"IARL", "IART", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI", |
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"IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD", |
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"IPRT", "ISBJ", "ISFT", "ISHP", "ISRC", "ISRF", "ITCH", |
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{ 0 } |
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}; |
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static int riff_has_valid_tags(AVFormatContext *s) |
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{ |
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int i; |
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for (i = 0; *riff_tags[i]; i++) |
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if (av_dict_get(s->metadata, riff_tags[i], NULL, AV_DICT_MATCH_CASE)) |
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return 1; |
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return 0; |
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} |
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void ff_riff_write_info(AVFormatContext *s) |
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{ |
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AVIOContext *pb = s->pb; |
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int i; |
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int64_t list_pos; |
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AVDictionaryEntry *t = NULL; |
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ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL); |
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/* writing empty LIST is not nice and may cause problems */ |
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if (!riff_has_valid_tags(s)) |
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return; |
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list_pos = ff_start_tag(pb, "LIST"); |
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ffio_wfourcc(pb, "INFO"); |
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for (i = 0; *riff_tags[i]; i++) |
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if ((t = av_dict_get(s->metadata, riff_tags[i], |
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NULL, AV_DICT_MATCH_CASE))) |
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ff_riff_write_info_tag(s->pb, t->key, t->value); |
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ff_end_tag(pb, list_pos); |
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} |
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