int64_t nb_frames_offset;
} MP3Context;
+/* insert a dummy frame containing number of frames */
+static void mp3_write_xing(AVFormatContext *s)
+{
+ MP3Context *mp3 = s->priv_data;
+ AVCodecContext *codec = s->streams[0]->codec;
+ int bitrate_idx = 1; // 32 kbps
+ int64_t xing_offset = (codec->channels == 2) ? 32 : 17;
+ int32_t header;
+ MPADecodeHeader mpah;
+ int srate_idx, i, channels;
+
+ if (!s->pb->seekable)
+ return;
+
+ for (i = 0; i < FF_ARRAY_ELEMS(avpriv_mpa_freq_tab); i++)
+ if (avpriv_mpa_freq_tab[i] == codec->sample_rate) {
+ srate_idx = i;
+ break;
+ }
+ if (i == FF_ARRAY_ELEMS(avpriv_mpa_freq_tab)) {
+ av_log(s, AV_LOG_ERROR, "Unsupported sample rate.\n");
+ return;
+ }
+
+ switch (codec->channels) {
+ case 1: channels = MPA_MONO; break;
+ case 2: channels = MPA_STEREO; break;
+ default: av_log(s, AV_LOG_ERROR, "Unsupported number of channels.\n"); return;
+ }
+
+ /* dummy MPEG audio header */
+ header = 0xff << 24; // sync
+ header |= (0x7 << 5 | 0x3 << 3 | 0x1 << 1 | 0x1) << 16; // sync/mpeg-1/layer 3/no crc*/
+ header |= (bitrate_idx << 4 | srate_idx << 2) << 8;
+ header |= channels << 6;
+ avio_wb32(s->pb, header);
+
+ avpriv_mpegaudio_decode_header(&mpah, header);
+
+ ffio_fill(s->pb, 0, xing_offset);
+ ffio_wfourcc(s->pb, "Xing");
+ avio_wb32(s->pb, 0x1); // only number of frames
+ mp3->nb_frames_offset = avio_tell(s->pb);
+ avio_wb32(s->pb, 0);
+
+ mpah.frame_size -= 4 + xing_offset + 4 + 4 + 4;
+ ffio_fill(s->pb, 0, mpah.frame_size);
+}
+
static int mp3_write_trailer(struct AVFormatContext *s)
{
uint8_t buf[ID3v1_TAG_SIZE];
.version = LIBAVUTIL_VERSION_INT,
};
-/* insert a dummy frame containing number of frames */
-static void mp3_write_xing(AVFormatContext *s)
-{
- AVCodecContext *codec = s->streams[0]->codec;
- MP3Context *mp3 = s->priv_data;
- int bitrate_idx = 1; // 32 kbps
- int64_t xing_offset = (codec->channels == 2) ? 32 : 17;
- int32_t header;
- MPADecodeHeader mpah;
- int srate_idx, i, channels;
-
- for (i = 0; i < FF_ARRAY_ELEMS(avpriv_mpa_freq_tab); i++)
- if (avpriv_mpa_freq_tab[i] == codec->sample_rate) {
- srate_idx = i;
- break;
- }
- if (i == FF_ARRAY_ELEMS(avpriv_mpa_freq_tab)) {
- av_log(s, AV_LOG_ERROR, "Unsupported sample rate.\n");
- return;
- }
-
- switch (codec->channels) {
- case 1: channels = MPA_MONO; break;
- case 2: channels = MPA_STEREO; break;
- default: av_log(s, AV_LOG_ERROR, "Unsupported number of channels.\n"); return;
- }
-
- /* dummy MPEG audio header */
- header = 0xff << 24; // sync
- header |= (0x7 << 5 | 0x3 << 3 | 0x1 << 1 | 0x1) << 16; // sync/mpeg-1/layer 3/no crc*/
- header |= (bitrate_idx << 4 | srate_idx << 2) << 8;
- header |= channels << 6;
- avio_wb32(s->pb, header);
-
- avpriv_mpegaudio_decode_header(&mpah, header);
-
- ffio_fill(s->pb, 0, xing_offset);
- ffio_wfourcc(s->pb, "Xing");
- avio_wb32(s->pb, 0x1); // only number of frames
- mp3->nb_frames_offset = avio_tell(s->pb);
- avio_wb32(s->pb, 0);
-
- mpah.frame_size -= 4 + xing_offset + 4 + 4 + 4;
- ffio_fill(s->pb, 0, mpah.frame_size);
-}
/**
* Write an ID3v2 header at beginning of stream