2 * RIFF muxing functions
3 * Copyright (c) 2000 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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)
42 av_assert0((start&1) == 0);
47 avio_seek(pb, start - 4, SEEK_SET);
48 avio_wl32(pb, (uint32_t)(pos - start));
49 avio_seek(pb, FFALIGN(pos, 2), SEEK_SET);
52 /* WAVEFORMATEX header */
53 /* returns the size or -1 on error */
54 int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc, int flags)
56 int bps, blkalign, bytespersec, frame_size;
58 int64_t hdrstart = avio_tell(pb);
59 int waveformatextensible;
61 uint8_t *riff_extradata = temp;
62 uint8_t *riff_extradata_start = temp;
64 if (!enc->codec_tag || enc->codec_tag > 0xffff)
67 /* We use the known constant frame size for the codec if known, otherwise
68 * fall back on using AVCodecContext.frame_size, which is not as reliable
69 * for indicating packet duration. */
70 frame_size = av_get_audio_frame_duration(enc, enc->block_align);
72 waveformatextensible = (enc->channels > 2 && enc->channel_layout) ||
73 enc->sample_rate > 48000 ||
74 enc->codec_id == AV_CODEC_ID_EAC3 ||
75 av_get_bits_per_sample(enc->codec_id) > 16;
77 if (waveformatextensible)
78 avio_wl16(pb, 0xfffe);
80 avio_wl16(pb, enc->codec_tag);
82 avio_wl16(pb, enc->channels);
83 avio_wl32(pb, enc->sample_rate);
84 if (enc->codec_id == AV_CODEC_ID_ATRAC3 ||
85 enc->codec_id == AV_CODEC_ID_G723_1 ||
86 enc->codec_id == AV_CODEC_ID_MP2 ||
87 enc->codec_id == AV_CODEC_ID_MP3 ||
88 enc->codec_id == AV_CODEC_ID_GSM_MS) {
91 if (!(bps = av_get_bits_per_sample(enc->codec_id))) {
92 if (enc->bits_per_coded_sample)
93 bps = enc->bits_per_coded_sample;
95 bps = 16; // default to 16
98 if (bps != enc->bits_per_coded_sample && enc->bits_per_coded_sample) {
99 av_log(enc, AV_LOG_WARNING,
100 "requested bits_per_coded_sample (%d) "
101 "and actually stored (%d) differ\n",
102 enc->bits_per_coded_sample, bps);
105 if (enc->codec_id == AV_CODEC_ID_MP2) {
106 blkalign = frame_size;
107 } else if (enc->codec_id == AV_CODEC_ID_MP3) {
108 blkalign = 576 * (enc->sample_rate <= (24000 + 32000)/2 ? 1 : 2);
109 } else if (enc->codec_id == AV_CODEC_ID_AC3) {
110 blkalign = 3840; /* maximum bytes per frame */
111 } else if (enc->codec_id == AV_CODEC_ID_AAC) {
112 blkalign = 768 * enc->channels; /* maximum bytes per frame */
113 } else if (enc->codec_id == AV_CODEC_ID_G723_1) {
115 } else if (enc->block_align != 0) { /* specified by the codec */
116 blkalign = enc->block_align;
118 blkalign = bps * enc->channels / av_gcd(8, bps);
119 if (enc->codec_id == AV_CODEC_ID_PCM_U8 ||
120 enc->codec_id == AV_CODEC_ID_PCM_S24LE ||
121 enc->codec_id == AV_CODEC_ID_PCM_S32LE ||
122 enc->codec_id == AV_CODEC_ID_PCM_F32LE ||
123 enc->codec_id == AV_CODEC_ID_PCM_F64LE ||
124 enc->codec_id == AV_CODEC_ID_PCM_S16LE) {
125 bytespersec = enc->sample_rate * blkalign;
126 } else if (enc->codec_id == AV_CODEC_ID_G723_1) {
129 bytespersec = enc->bit_rate / 8;
131 avio_wl32(pb, bytespersec); /* bytes per second */
132 avio_wl16(pb, blkalign); /* block align */
133 avio_wl16(pb, bps); /* bits per sample */
134 if (enc->codec_id == AV_CODEC_ID_MP3) {
135 bytestream_put_le16(&riff_extradata, 1); /* wID */
136 bytestream_put_le32(&riff_extradata, 2); /* fdwFlags */
137 bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */
138 bytestream_put_le16(&riff_extradata, 1); /* nFramesPerBlock */
139 bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */
140 } else if (enc->codec_id == AV_CODEC_ID_MP2) {
142 bytestream_put_le16(&riff_extradata, 2);
144 bytestream_put_le32(&riff_extradata, enc->bit_rate);
146 bytestream_put_le16(&riff_extradata, enc->channels == 2 ? 1 : 8);
148 bytestream_put_le16(&riff_extradata, 0);
150 bytestream_put_le16(&riff_extradata, 1);
152 bytestream_put_le16(&riff_extradata, 16);
154 bytestream_put_le32(&riff_extradata, 0);
156 bytestream_put_le32(&riff_extradata, 0);
157 } else if (enc->codec_id == AV_CODEC_ID_G723_1) {
158 bytestream_put_le32(&riff_extradata, 0x9ace0002); /* extradata needed for msacm g723.1 codec */
159 bytestream_put_le32(&riff_extradata, 0xaea2f732);
160 bytestream_put_le16(&riff_extradata, 0xacde);
161 } else if (enc->codec_id == AV_CODEC_ID_GSM_MS ||
162 enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
163 /* wSamplesPerBlock */
164 bytestream_put_le16(&riff_extradata, frame_size);
165 } else if (enc->extradata_size) {
166 riff_extradata_start = enc->extradata;
167 riff_extradata = enc->extradata + enc->extradata_size;
169 /* write WAVEFORMATEXTENSIBLE extensions */
170 if (waveformatextensible) {
171 int write_channel_mask = enc->strict_std_compliance < FF_COMPLIANCE_NORMAL ||
172 enc->channel_layout < 0x40000;
173 /* 22 is WAVEFORMATEXTENSIBLE size */
174 avio_wl16(pb, riff_extradata - riff_extradata_start + 22);
175 /* ValidBitsPerSample || SamplesPerBlock || Reserved */
178 avio_wl32(pb, write_channel_mask ? enc->channel_layout : 0);
180 if (enc->codec_id == AV_CODEC_ID_EAC3) {
181 ff_put_guid(pb, ff_get_codec_guid(enc->codec_id, ff_codec_wav_guids));
183 avio_wl32(pb, enc->codec_tag);
184 avio_wl32(pb, 0x00100000);
185 avio_wl32(pb, 0xAA000080);
186 avio_wl32(pb, 0x719B3800);
188 } else if ((flags & FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX) ||
189 enc->codec_tag != 0x0001 /* PCM */ ||
190 riff_extradata - riff_extradata_start) {
192 avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */
193 } /* else PCMWAVEFORMAT */
194 avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start);
195 hdrsize = avio_tell(pb) - hdrstart;
204 /* BITMAPINFOHEADER header */
205 void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc,
206 const AVCodecTag *tags, int for_asf, int ignore_extradata)
208 int keep_height = enc->extradata_size >= 9 &&
209 !memcmp(enc->extradata + enc->extradata_size - 9, "BottomUp", 9);
210 int extradata_size = enc->extradata_size - 9*keep_height;
213 avio_wl32(pb, 40 + (ignore_extradata ? 0 :extradata_size));
214 avio_wl32(pb, enc->width);
215 //We always store RGB TopDown
216 avio_wl32(pb, enc->codec_tag || keep_height ? enc->height : -enc->height);
220 avio_wl16(pb, enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24);
221 /* compression type */
222 avio_wl32(pb, enc->codec_tag);
223 avio_wl32(pb, (enc->width * enc->height * (enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24)+7) / 8);
229 if (!ignore_extradata) {
230 avio_write(pb, enc->extradata, extradata_size);
232 if (!for_asf && extradata_size & 1)
237 void ff_parse_specific_params(AVStream *st, int *au_rate,
238 int *au_ssize, int *au_scale)
240 AVCodecContext *codec = st->codec;
242 int audio_frame_size;
244 /* We use the known constant frame size for the codec if known, otherwise
245 * fall back on using AVCodecContext.frame_size, which is not as reliable
246 * for indicating packet duration. */
247 audio_frame_size = av_get_audio_frame_duration(codec, 0);
248 if (!audio_frame_size)
249 audio_frame_size = codec->frame_size;
251 *au_ssize = codec->block_align;
252 if (audio_frame_size && codec->sample_rate) {
253 *au_scale = audio_frame_size;
254 *au_rate = codec->sample_rate;
255 } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO ||
256 codec->codec_type == AVMEDIA_TYPE_DATA ||
257 codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
258 *au_scale = st->time_base.num;
259 *au_rate = st->time_base.den;
261 *au_scale = codec->block_align ? codec->block_align * 8 : 8;
262 *au_rate = codec->bit_rate ? codec->bit_rate :
263 8 * codec->sample_rate;
265 gcd = av_gcd(*au_scale, *au_rate);
270 void ff_riff_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
272 size_t len = strlen(str);
273 if (len > 0 && len < UINT32_MAX) {
275 ffio_wfourcc(pb, tag);
277 avio_put_str(pb, str);
283 static const char riff_tags[][5] = {
284 "IARL", "IART", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI",
285 "IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD",
286 "IPRT", "ITRK", "ISBJ", "ISFT", "ISHP", "ISMP", "ISRC", "ISRF", "ITCH",
290 static int riff_has_valid_tags(AVFormatContext *s)
294 for (i = 0; *riff_tags[i]; i++)
295 if (av_dict_get(s->metadata, riff_tags[i], NULL, AV_DICT_MATCH_CASE))
301 void ff_riff_write_info(AVFormatContext *s)
303 AVIOContext *pb = s->pb;
306 AVDictionaryEntry *t = NULL;
308 ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL);
310 /* writing empty LIST is not nice and may cause problems */
311 if (!riff_has_valid_tags(s))
314 list_pos = ff_start_tag(pb, "LIST");
315 ffio_wfourcc(pb, "INFO");
316 for (i = 0; *riff_tags[i]; i++)
317 if ((t = av_dict_get(s->metadata, riff_tags[i],
318 NULL, AV_DICT_MATCH_CASE)))
319 ff_riff_write_info_tag(s->pb, t->key, t->value);
320 ff_end_tag(pb, list_pos);
323 void ff_put_guid(AVIOContext *s, const ff_asf_guid *g)
325 av_assert0(sizeof(*g) == 16);
326 avio_write(s, *g, sizeof(*g));
329 const ff_asf_guid *ff_get_codec_guid(enum AVCodecID id, const AVCodecGuid *av_guid)
332 for (i = 0; av_guid[i].id != AV_CODEC_ID_NONE; i++) {
333 if (id == av_guid[i].id)
334 return &(av_guid[i].guid);