FFmpeg: libavformat/aiffenc.c Source File

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libavformat

aiffenc.c

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1 /*

2 * AIFF/AIFF-C muxer

4 *

5 * This file is part of FFmpeg.

6 *

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.

11 *

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.

16 *

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

20 */

22 #include "libavutil/intfloat.h"

23 #include "libavutil/opt.h"

24 #include "avformat.h"

25 #include "internal.h"

26 #include "aiff.h"

27 #include "avio_internal.h"

28 #include "isom.h"

29 #include "id3v2.h"

31 typedef struct {

32 const AVClass *class;

33 int64_t form;

34 int64_t frames;

35 int64_t ssnd;

36 int audio_stream_idx;

37 AVPacketList *pict_list;

38 int write_id3v2;

39 int id3v2_version;

40 } AIFFOutputContext;

42 static int put_id3v2_tags(AVFormatContext *s, AIFFOutputContext *aiff)

43 {

44 int ret;

45 uint64_t pos, end, size;

46 ID3v2EncContext id3v2 = { 0 };

47 AVIOContext *pb = s->pb;

48 AVPacketList *pict_list = aiff->pict_list;

50 if (!pb->seekable)

51 return 0;

53 if (!s->metadata && !aiff->pict_list)

54 return 0;

56 avio_wl32(pb, MKTAG('I', 'D', '3', ' '));

57 avio_wb32(pb, 0);

58 pos = avio_tell(pb);

60 ff_id3v2_start(&id3v2, pb, aiff->id3v2_version, ID3v2_DEFAULT_MAGIC);

61 ff_id3v2_write_metadata(s, &id3v2);

62 while (pict_list) {

63 if ((ret = ff_id3v2_write_apic(s, &id3v2, &pict_list->pkt)) < 0)

64 return ret;

65 pict_list = pict_list->next;

66 }

67 ff_id3v2_finish(&id3v2, pb);

69 end = avio_tell(pb);

70 size = end - pos;

72 /* Update chunk size */

73 avio_seek(pb, pos - 4, SEEK_SET);

74 avio_wb32(pb, size);

75 avio_seek(pb, end, SEEK_SET);

77 if (size & 1)

78 avio_w8(pb, 0);

80 return 0;

81 }

83 static void put_meta(AVFormatContext *s, const char *key, uint32_t id)

84 {

85 AVDictionaryEntry *tag;

86 AVIOContext *pb = s->pb;

88 if (tag = av_dict_get(s->metadata, key, NULL, 0)) {

89 int size = strlen(tag->value);

91 avio_wl32(pb, id);

92 avio_wb32(pb, FFALIGN(size, 2));

93 avio_write(pb, tag->value, size);

94 if (size & 1)

95 avio_w8(pb, 0);

96 }

97 }

99 static int aiff_write_header(AVFormatContext *s)

100 {

101 AIFFOutputContext *aiff = s->priv_data;

102 AVIOContext *pb = s->pb;

103 AVCodecContext *enc;

104 uint64_t sample_rate;

105 int i, aifc = 0;

106

107 aiff->audio_stream_idx = -1;

108 for (i = 0; i < s->nb_streams; i++) {

109 AVStream *st = s->streams[i];

110 if (aiff->audio_stream_idx < 0 && st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

111 aiff->audio_stream_idx = i;

112 } else if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO) {

113 av_log(s, AV_LOG_ERROR, "Only audio streams and pictures are allowed in AIFF.\n");

114 return AVERROR(EINVAL);

115 }

116 }

117 if (aiff->audio_stream_idx < 0) {

118 av_log(s, AV_LOG_ERROR, "No audio stream present.\n");

119 return AVERROR(EINVAL);

120 }

121

122 enc = s->streams[aiff->audio_stream_idx]->codec;

123

124 /* First verify if format is ok */

125 if (!enc->codec_tag)

126 return -1;

127 if (enc->codec_tag != MKTAG('N','O','N','E'))

128 aifc = 1;

129

130 /* FORM AIFF header */

131 ffio_wfourcc(pb, "FORM");

132 aiff->form = avio_tell(pb);

133 avio_wb32(pb, 0); /* file length */

134 ffio_wfourcc(pb, aifc ? "AIFC" : "AIFF");

135

136 if (aifc) { // compressed audio

137 if (!enc->block_align) {

138 av_log(s, AV_LOG_ERROR, "block align not set\n");

139 return -1;

140 }

141 /* Version chunk */

142 ffio_wfourcc(pb, "FVER");

143 avio_wb32(pb, 4);

144 avio_wb32(pb, 0xA2805140);

145 }

146

147 if (enc->channels > 2 && enc->channel_layout) {

148 ffio_wfourcc(pb, "CHAN");

149 avio_wb32(pb, 12);

150 ff_mov_write_chan(pb, enc->channel_layout);

151 }

152

153 put_meta(s, "title", MKTAG('N', 'A', 'M', 'E'));

154 put_meta(s, "author", MKTAG('A', 'U', 'T', 'H'));

155 put_meta(s, "copyright", MKTAG('(', 'c', ')', ' '));

156 put_meta(s, "comment", MKTAG('A', 'N', 'N', 'O'));

157

158 /* Common chunk */

159 ffio_wfourcc(pb, "COMM");

160 avio_wb32(pb, aifc ? 24 : 18); /* size */

161 avio_wb16(pb, enc->channels); /* Number of channels */

162

163 aiff->frames = avio_tell(pb);

164 avio_wb32(pb, 0); /* Number of frames */

165

166 if (!enc->bits_per_coded_sample)

167 enc->bits_per_coded_sample = av_get_bits_per_sample(enc->codec_id);

168 if (!enc->bits_per_coded_sample) {

169 av_log(s, AV_LOG_ERROR, "could not compute bits per sample\n");

170 return -1;

171 }

172 if (!enc->block_align)

173 enc->block_align = (enc->bits_per_coded_sample * enc->channels) >> 3;

174

175 avio_wb16(pb, enc->bits_per_coded_sample); /* Sample size */

176

177 sample_rate = av_double2int(enc->sample_rate);

178 avio_wb16(pb, (sample_rate >> 52) + (16383 - 1023));

179 avio_wb64(pb, UINT64_C(1) << 63 | sample_rate << 11);

180

181 if (aifc) {

182 avio_wl32(pb, enc->codec_tag);

183 avio_wb16(pb, 0);

184 }

185

186 if (enc->codec_tag == MKTAG('Q','D','M','2') && enc->extradata_size) {

187 ffio_wfourcc(pb, "wave");

188 avio_wb32(pb, enc->extradata_size);

189 avio_write(pb, enc->extradata, enc->extradata_size);

190 }

191

192 /* Sound data chunk */

193 ffio_wfourcc(pb, "SSND");

194 aiff->ssnd = avio_tell(pb); /* Sound chunk size */

195 avio_wb32(pb, 0); /* Sound samples data size */

196 avio_wb32(pb, 0); /* Data offset */

197 avio_wb32(pb, 0); /* Block-size (block align) */

198

199 avpriv_set_pts_info(s->streams[aiff->audio_stream_idx], 64, 1,

200 s->streams[aiff->audio_stream_idx]->codec->sample_rate);

201

202 /* Data is starting here */

203 avio_flush(pb);

204

205 return 0;

206 }

207

208 static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)

209 {

210 AIFFOutputContext *aiff = s->priv_data;

211 AVIOContext *pb = s->pb;

212 if (pkt->stream_index == aiff->audio_stream_idx)

213 avio_write(pb, pkt->data, pkt->size);

214 else {

215 int ret;

216 AVPacketList *pict_list, *last;

217

218 if (s->streams[pkt->stream_index]->codec->codec_type != AVMEDIA_TYPE_VIDEO)

219 return 0;

220

221 /* warn only once for each stream */

222 if (s->streams[pkt->stream_index]->nb_frames == 1) {

223 av_log(s, AV_LOG_WARNING, "Got more than one picture in stream %d,"

224 " ignoring.\n", pkt->stream_index);

225 }

226 if (s->streams[pkt->stream_index]->nb_frames >= 1)

227 return 0;

228

229 pict_list = av_mallocz(sizeof(AVPacketList));

230 if (!pict_list)

231 return AVERROR(ENOMEM);

232

233 if ((ret = av_copy_packet(&pict_list->pkt, pkt)) < 0) {

234 av_freep(&pict_list);

235 return ret;

236 }

237

238 if (!aiff->pict_list)

239 aiff->pict_list = pict_list;

240 else {

241 last = aiff->pict_list;

242 while (last->next)

243 last = last->next;

244 last->next = pict_list;

245 }

246 }

247

248 return 0;

249 }

250

251 static int aiff_write_trailer(AVFormatContext *s)

252 {

253 int ret;

254 AVIOContext *pb = s->pb;

255 AIFFOutputContext *aiff = s->priv_data;

256 AVPacketList *pict_list = aiff->pict_list;

257 AVCodecContext *enc = s->streams[aiff->audio_stream_idx]->codec;

258

259 /* Chunks sizes must be even */

260 int64_t file_size, end_size;

261 end_size = file_size = avio_tell(pb);

262 if (file_size & 1) {

263 avio_w8(pb, 0);

264 end_size++;

265 }

266

267 if (s->pb->seekable) {

268 /* Number of sample frames */

269 avio_seek(pb, aiff->frames, SEEK_SET);

270 avio_wb32(pb, (file_size-aiff->ssnd-12)/enc->block_align);

271

272 /* Sound Data chunk size */

273 avio_seek(pb, aiff->ssnd, SEEK_SET);

274 avio_wb32(pb, file_size - aiff->ssnd - 4);

275

276 /* return to the end */

277 avio_seek(pb, end_size, SEEK_SET);

278

279 /* Write ID3 tags */

280 if (aiff->write_id3v2)

281 if ((ret = put_id3v2_tags(s, aiff)) < 0)

282 return ret;

283

284 /* File length */

285 file_size = avio_tell(pb);

286 avio_seek(pb, aiff->form, SEEK_SET);

287 avio_wb32(pb, file_size - aiff->form - 4);

288

289 avio_flush(pb);

290 }

291

292 while (pict_list) {

293 AVPacketList *next = pict_list->next;

294 av_free_packet(&pict_list->pkt);

295 av_freep(&pict_list);

296 pict_list = next;

297 }

298

299 return 0;

300 }

301

302 #define OFFSET(x) offsetof(AIFFOutputContext, x)

303 #define ENC AV_OPT_FLAG_ENCODING_PARAM

304 static const AVOption options[] = {

305 { "write_id3v2", "Enable ID3 tags writing.",

306 OFFSET(write_id3v2), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, ENC },

307 { "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",

308 OFFSET(id3v2_version), AV_OPT_TYPE_INT, {.i64 = 4}, 3, 4, ENC },

309 { NULL },

310 };

311

312 static const AVClass aiff_muxer_class = {

313 .class_name = "AIFF muxer",

314 .item_name = av_default_item_name,

315 .option = options,

316 .version = LIBAVUTIL_VERSION_INT,

317 };

318

319 AVOutputFormat ff_aiff_muxer = {

320 .name = "aiff",

321 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),

322 .mime_type = "audio/aiff",

323 .extensions = "aif,aiff,afc,aifc",

324 .priv_data_size = sizeof(AIFFOutputContext),

325 .audio_codec = AV_CODEC_ID_PCM_S16BE,

326 .video_codec = AV_CODEC_ID_PNG,

327 .write_header = aiff_write_header,

328 .write_packet = aiff_write_packet,

329 .write_trailer = aiff_write_trailer,

330 .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },

331 .priv_class = &aiff_muxer_class,

332 };

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