2 * RIFF muxing functions
3 * Copyright (c) 2000 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/dict.h"
23 #include "libavutil/log.h"
24 #include "libavutil/mathematics.h"
25 #include "libavcodec/avcodec.h"
26 #include "libavcodec/bytestream.h"
28 #include "avio_internal.h"
31 int64_t ff_start_tag(AVIOContext *pb, const char *tag)
33 ffio_wfourcc(pb, tag);
38 void ff_end_tag(AVIOContext *pb, int64_t start)
43 avio_seek(pb, start - 4, SEEK_SET);
44 avio_wl32(pb, (uint32_t)(pos - start));
45 avio_seek(pb, pos, SEEK_SET);
48 /* WAVEFORMATEX header */
49 /* returns the size or -1 on error */
50 int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc)
52 int bps, blkalign, bytespersec, frame_size;
54 int waveformatextensible;
56 uint8_t *riff_extradata = temp;
57 uint8_t *riff_extradata_start = temp;
59 if (!enc->codec_tag || enc->codec_tag > 0xffff)
62 /* We use the known constant frame size for the codec if known, otherwise
63 * fall back on using AVCodecContext.frame_size, which is not as reliable
64 * for indicating packet duration. */
65 frame_size = av_get_audio_frame_duration(enc, enc->block_align);
67 frame_size = enc->frame_size;
69 waveformatextensible = (enc->channels > 2 && enc->channel_layout) ||
70 enc->sample_rate > 48000 ||
71 av_get_bits_per_sample(enc->codec_id) > 16;
73 if (waveformatextensible)
74 avio_wl16(pb, 0xfffe);
76 avio_wl16(pb, enc->codec_tag);
78 avio_wl16(pb, enc->channels);
79 avio_wl32(pb, enc->sample_rate);
80 if (enc->codec_id == AV_CODEC_ID_MP2 ||
81 enc->codec_id == AV_CODEC_ID_MP3 ||
82 enc->codec_id == AV_CODEC_ID_GSM_MS) {
85 if (!(bps = av_get_bits_per_sample(enc->codec_id))) {
86 if (enc->bits_per_coded_sample)
87 bps = enc->bits_per_coded_sample;
89 bps = 16; // default to 16
92 if (bps != enc->bits_per_coded_sample && enc->bits_per_coded_sample) {
93 av_log(enc, AV_LOG_WARNING,
94 "requested bits_per_coded_sample (%d) "
95 "and actually stored (%d) differ\n",
96 enc->bits_per_coded_sample, bps);
99 if (enc->codec_id == AV_CODEC_ID_MP2 ||
100 enc->codec_id == AV_CODEC_ID_MP3) {
101 /* This is wrong, but it seems many demuxers do not work if this
102 * is set correctly. */
103 blkalign = frame_size;
104 // blkalign = 144 * enc->bit_rate/enc->sample_rate;
105 } else if (enc->codec_id == AV_CODEC_ID_AC3) {
106 blkalign = 3840; /* maximum bytes per frame */
107 } else if (enc->block_align != 0) { /* specified by the codec */
108 blkalign = enc->block_align;
110 blkalign = bps * enc->channels / av_gcd(8, bps);
111 if (enc->codec_id == AV_CODEC_ID_PCM_U8 ||
112 enc->codec_id == AV_CODEC_ID_PCM_S24LE ||
113 enc->codec_id == AV_CODEC_ID_PCM_S32LE ||
114 enc->codec_id == AV_CODEC_ID_PCM_F32LE ||
115 enc->codec_id == AV_CODEC_ID_PCM_F64LE ||
116 enc->codec_id == AV_CODEC_ID_PCM_S16LE) {
117 bytespersec = enc->sample_rate * blkalign;
119 bytespersec = enc->bit_rate / 8;
121 avio_wl32(pb, bytespersec); /* bytes per second */
122 avio_wl16(pb, blkalign); /* block align */
123 avio_wl16(pb, bps); /* bits per sample */
124 if (enc->codec_id == AV_CODEC_ID_MP3) {
126 bytestream_put_le16(&riff_extradata, 1); /* wID */
127 bytestream_put_le32(&riff_extradata, 2); /* fdwFlags */
128 bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */
129 bytestream_put_le16(&riff_extradata, 1); /* nFramesPerBlock */
130 bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */
131 } else if (enc->codec_id == AV_CODEC_ID_MP2) {
134 bytestream_put_le16(&riff_extradata, 2);
136 bytestream_put_le32(&riff_extradata, enc->bit_rate);
138 bytestream_put_le16(&riff_extradata, enc->channels == 2 ? 1 : 8);
140 bytestream_put_le16(&riff_extradata, 0);
142 bytestream_put_le16(&riff_extradata, 1);
144 bytestream_put_le16(&riff_extradata, 16);
146 bytestream_put_le32(&riff_extradata, 0);
148 bytestream_put_le32(&riff_extradata, 0);
149 } else if (enc->codec_id == AV_CODEC_ID_GSM_MS ||
150 enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
152 /* wSamplesPerBlock */
153 bytestream_put_le16(&riff_extradata, frame_size);
154 } else if (enc->extradata_size) {
155 riff_extradata_start = enc->extradata;
156 riff_extradata = enc->extradata + enc->extradata_size;
157 hdrsize += enc->extradata_size;
159 /* write WAVEFORMATEXTENSIBLE extensions */
160 if (waveformatextensible) {
162 /* 22 is WAVEFORMATEXTENSIBLE size */
163 avio_wl16(pb, riff_extradata - riff_extradata_start + 22);
164 /* ValidBitsPerSample || SamplesPerBlock || Reserved */
167 avio_wl32(pb, enc->channel_layout);
169 avio_wl32(pb, enc->codec_tag);
170 avio_wl32(pb, 0x00100000);
171 avio_wl32(pb, 0xAA000080);
172 avio_wl32(pb, 0x719B3800);
174 avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */
176 avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start);
185 /* BITMAPINFOHEADER header */
186 void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc,
187 const AVCodecTag *tags, int for_asf)
190 avio_wl32(pb, 40 + enc->extradata_size);
191 avio_wl32(pb, enc->width);
192 //We always store RGB TopDown
193 avio_wl32(pb, enc->codec_tag ? enc->height : -enc->height);
197 avio_wl16(pb, enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24);
198 /* compression type */
199 avio_wl32(pb, enc->codec_tag);
200 avio_wl32(pb, enc->width * enc->height * 3);
206 avio_write(pb, enc->extradata, enc->extradata_size);
208 if (!for_asf && enc->extradata_size & 1)
212 void ff_parse_specific_params(AVStream *st, int *au_rate,
213 int *au_ssize, int *au_scale)
215 AVCodecContext *codec = st->codec;
217 int audio_frame_size;
219 /* We use the known constant frame size for the codec if known, otherwise
220 * fall back on using AVCodecContext.frame_size, which is not as reliable
221 * for indicating packet duration. */
222 audio_frame_size = av_get_audio_frame_duration(codec, 0);
223 if (!audio_frame_size)
224 audio_frame_size = codec->frame_size;
226 *au_ssize = codec->block_align;
227 if (audio_frame_size && codec->sample_rate) {
228 *au_scale = audio_frame_size;
229 *au_rate = codec->sample_rate;
230 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO ||
231 codec->codec_type == AVMEDIA_TYPE_DATA ||
232 codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
233 *au_scale = codec->time_base.num;
234 *au_rate = codec->time_base.den;
236 *au_scale = codec->block_align ? codec->block_align * 8 : 8;
237 *au_rate = codec->bit_rate ? codec->bit_rate :
238 8 * codec->sample_rate;
240 gcd = av_gcd(*au_scale, *au_rate);
245 void ff_riff_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
247 int len = strlen(str);
250 ffio_wfourcc(pb, tag);
252 avio_put_str(pb, str);
258 static const char riff_tags[][5] = {
259 "IARL", "IART", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI",
260 "IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD",
261 "IPRT", "ITRK", "ISBJ", "ISFT", "ISHP", "ISMP", "ISRC", "ISRF", "ITCH",
265 static int riff_has_valid_tags(AVFormatContext *s)
269 for (i = 0; *riff_tags[i]; i++)
270 if (av_dict_get(s->metadata, riff_tags[i], NULL, AV_DICT_MATCH_CASE))
276 void ff_riff_write_info(AVFormatContext *s)
278 AVIOContext *pb = s->pb;
281 AVDictionaryEntry *t = NULL;
283 ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL);
285 /* writing empty LIST is not nice and may cause problems */
286 if (!riff_has_valid_tags(s))
289 list_pos = ff_start_tag(pb, "LIST");
290 ffio_wfourcc(pb, "INFO");
291 for (i = 0; *riff_tags[i]; i++)
292 if ((t = av_dict_get(s->metadata, riff_tags[i],
293 NULL, AV_DICT_MATCH_CASE)))
294 ff_riff_write_info_tag(s->pb, t->key, t->value);
295 ff_end_tag(pb, list_pos);