#include "libavutil/opt.h"
#include "libavutil/dict.h"
#include "libavutil/avassert.h"
+#include "libavutil/crc.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/replaygain.h"
static int id3v1_set_string(AVFormatContext *s, const char *key,
uint8_t *buf, int buf_size)
return count;
}
+#define XING_NUM_BAGS 400
+#define XING_TOC_SIZE 100
+// size of the XING/LAME data, starting from the Xing tag
+#define XING_SIZE 156
+
typedef struct MP3Context {
const AVClass *class;
ID3v2EncContext id3;
int id3v2_version;
int write_id3v1;
- int64_t nb_frames_offset;
+ int write_xing;
+
+ /* xing header */
+ // a buffer containing the whole XING/LAME frame
+ uint8_t *xing_frame;
+ int xing_frame_size;
+
+ AVCRC audio_crc; // CRC of the audio data
+ uint32_t audio_size; // total size of the audio data
+
+ // offset of the XING/LAME frame in the file
+ int64_t xing_frame_offset;
+ // offset of the XING/INFO tag in the frame
+ int xing_offset;
+
+ int32_t frames;
+ int32_t size;
+ uint32_t want;
+ uint32_t seen;
+ uint32_t pos;
+ uint64_t bag[XING_NUM_BAGS];
+ int initial_bitrate;
+ int has_variable_bitrate;
/* index of the audio stream */
int audio_stream_idx;
AVPacketList *queue, *queue_end;
} MP3Context;
-/* insert a dummy frame containing number of frames */
+static const uint8_t xing_offtbl[2][2] = {{32, 17}, {17, 9}};
+
+/*
+ * Write an empty XING header and initialize respective data.
+ */
static void mp3_write_xing(AVFormatContext *s)
{
MP3Context *mp3 = s->priv_data;
- AVCodecContext *codec = s->streams[mp3->audio_stream_idx]->codec;
- int bitrate_idx = 1; // 32 kbps
- int64_t xing_offset = (codec->channels == 2) ? 32 : 17;
+ AVCodecParameters *par = s->streams[mp3->audio_stream_idx]->codecpar;
+ AVDictionaryEntry *enc = av_dict_get(s->streams[mp3->audio_stream_idx]->metadata, "encoder", NULL, 0);
+ AVIOContext *dyn_ctx;
int32_t header;
MPADecodeHeader mpah;
int srate_idx, i, channels;
-
- if (!s->pb->seekable)
+ int bitrate_idx;
+ int best_bitrate_idx;
+ int best_bitrate_error = INT_MAX;
+ int ret;
+ int ver = 0;
+ int lsf, bytes_needed;
+
+ if (!s->pb->seekable || !mp3->write_xing)
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;
- }
+ for (i = 0; i < FF_ARRAY_ELEMS(avpriv_mpa_freq_tab); i++) {
+ const uint16_t base_freq = avpriv_mpa_freq_tab[i];
+
+ if (par->sample_rate == base_freq) ver = 0x3; // MPEG 1
+ else if (par->sample_rate == base_freq / 2) ver = 0x2; // MPEG 2
+ else if (par->sample_rate == base_freq / 4) ver = 0x0; // MPEG 2.5
+ else continue;
+
+ srate_idx = i;
+ break;
+ }
if (i == FF_ARRAY_ELEMS(avpriv_mpa_freq_tab)) {
- av_log(s, AV_LOG_ERROR, "Unsupported sample rate.\n");
+ av_log(s, AV_LOG_WARNING, "Unsupported sample rate, not writing Xing "
+ "header.\n");
return;
}
- switch (codec->channels) {
+ switch (par->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;
+ default: av_log(s, AV_LOG_WARNING, "Unsupported number of channels, "
+ "not writing Xing header.\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 |= (0x7 << 5 | ver << 3 | 0x1 << 1 | 0x1) << 16; // sync/audio-version/layer 3/no crc*/
+ header |= (srate_idx << 2) << 8;
header |= channels << 6;
- avio_wb32(s->pb, header);
+
+ lsf = !((header & (1 << 20) && header & (1 << 19)));
+
+ mp3->xing_offset = xing_offtbl[ver != 3][channels == 1] + 4;
+ bytes_needed = mp3->xing_offset + XING_SIZE;
+
+ for (bitrate_idx = 1; bitrate_idx < 15; bitrate_idx++) {
+ int bit_rate = 1000 * avpriv_mpa_bitrate_tab[lsf][3 - 1][bitrate_idx];
+ int error = FFABS(bit_rate - par->bit_rate);
+
+ if (error < best_bitrate_error){
+ best_bitrate_error = error;
+ best_bitrate_idx = bitrate_idx;
+ }
+ }
+
+ for (bitrate_idx = best_bitrate_idx; bitrate_idx < 15; bitrate_idx++) {
+ int32_t mask = bitrate_idx << (4 + 8);
+ header |= mask;
+
+ avpriv_mpegaudio_decode_header(&mpah, header);
+
+ if (bytes_needed <= mpah.frame_size)
+ break;
+
+ header &= ~mask;
+ }
+
+ ret = avio_open_dyn_buf(&dyn_ctx);
+ if (ret < 0)
+ return;
+
+ avio_wb32(dyn_ctx, 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);
+ av_assert0(mpah.frame_size >= bytes_needed);
+
+ ffio_fill(dyn_ctx, 0, mp3->xing_offset - 4);
+ ffio_wfourcc(dyn_ctx, "Xing");
+ avio_wb32(dyn_ctx, 0x01 | 0x02 | 0x04 | 0x08); // frames / size / TOC / vbr scale
+
+ mp3->size = mpah.frame_size;
+ mp3->want = 1;
+
+ avio_wb32(dyn_ctx, 0); // frames
+ avio_wb32(dyn_ctx, 0); // size
+
+ // TOC
+ for (i = 0; i < XING_TOC_SIZE; i++)
+ avio_w8(dyn_ctx, 255 * i / XING_TOC_SIZE);
+
+ // vbr quality
+ // we write it, because some (broken) tools always expect it to be present
+ avio_wb32(dyn_ctx, 0);
+
+ // encoder short version string
+ if (enc) {
+ uint8_t encoder_str[9] = { 0 };
+ memcpy(encoder_str, enc->value, FFMIN(strlen(enc->value), sizeof(encoder_str)));
+ avio_write(dyn_ctx, encoder_str, sizeof(encoder_str));
+ } else
+ ffio_fill(dyn_ctx, 0, 9);
+
+ avio_w8(dyn_ctx, 0); // tag revision 0 / unknown vbr method
+ avio_w8(dyn_ctx, 0); // unknown lowpass filter value
+ ffio_fill(dyn_ctx, 0, 8); // empty replaygain fields
+ avio_w8(dyn_ctx, 0); // unknown encoding flags
+ avio_w8(dyn_ctx, 0); // unknown abr/minimal bitrate
+
+ // encoder delay
+ if (par->initial_padding >= 1 << 12 ||
+ par->trailing_padding >= 1 << 12) {
+ av_log(s, AV_LOG_WARNING, "Too many samples of padding.\n");
+ avio_wb24(dyn_ctx, 0);
+ } else {
+ avio_wb24(dyn_ctx, par->initial_padding << 12 | par->trailing_padding);
+ }
+
+ avio_w8(dyn_ctx, 0); // misc
+ avio_w8(dyn_ctx, 0); // mp3gain
+ avio_wb16(dyn_ctx, 0); // preset
+
+ // audio length and CRCs (will be updated later)
+ avio_wb32(dyn_ctx, 0); // music length
+ avio_wb16(dyn_ctx, 0); // music crc
+ avio_wb16(dyn_ctx, 0); // tag crc
+
+ ffio_fill(dyn_ctx, 0, mpah.frame_size - bytes_needed);
+
+ mp3->xing_frame_size = avio_close_dyn_buf(dyn_ctx, &mp3->xing_frame);
+ mp3->xing_frame_offset = avio_tell(s->pb);
+ avio_write(s->pb, mp3->xing_frame, mp3->xing_frame_size);
+
+ mp3->audio_size = mp3->xing_frame_size;
+}
+
+/*
+ * Add a frame to XING data.
+ * Following lame's "VbrTag.c".
+ */
+static void mp3_xing_add_frame(MP3Context *mp3, AVPacket *pkt)
+{
+ int i;
+
+ mp3->frames++;
+ mp3->seen++;
+ mp3->size += pkt->size;
- mpah.frame_size -= 4 + xing_offset + 4 + 4 + 4;
- ffio_fill(s->pb, 0, mpah.frame_size);
+ if (mp3->want == mp3->seen) {
+ mp3->bag[mp3->pos] = mp3->size;
+
+ if (XING_NUM_BAGS == ++mp3->pos) {
+ /* shrink table to half size by throwing away each second bag. */
+ for (i = 1; i < XING_NUM_BAGS; i += 2)
+ mp3->bag[i / 2] = mp3->bag[i];
+
+ /* double wanted amount per bag. */
+ mp3->want *= 2;
+ /* adjust current position to half of table size. */
+ mp3->pos = XING_NUM_BAGS / 2;
+ }
+
+ mp3->seen = 0;
+ }
+}
+
+static int mp3_write_audio_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ MP3Context *mp3 = s->priv_data;
+
+ if (mp3->xing_offset && pkt->size >= 4) {
+ MPADecodeHeader c;
+ int ret;
+ uint32_t h;
+
+ h = AV_RB32(pkt->data);
+ ret = avpriv_mpegaudio_decode_header(&c, h);
+ if (ret >= 0) {
+ if (!mp3->initial_bitrate)
+ mp3->initial_bitrate = c.bit_rate;
+ if ((c.bit_rate == 0) || (mp3->initial_bitrate != c.bit_rate))
+ mp3->has_variable_bitrate = 1;
+ }
+
+ mp3_xing_add_frame(mp3, pkt);
+
+ if (mp3->xing_offset) {
+ mp3->audio_size += pkt->size;
+ mp3->audio_crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE),
+ mp3->audio_crc, pkt->data, pkt->size);
+ }
+ }
+
+ return ff_raw_write_packet(s, pkt);
}
static int mp3_queue_flush(AVFormatContext *s)
mp3_write_xing(s);
while ((pktl = mp3->queue)) {
- if (write && (ret = ff_raw_write_packet(s, &pktl->pkt)) < 0)
+ if (write && (ret = mp3_write_audio_packet(s, &pktl->pkt)) < 0)
write = 0;
- av_free_packet(&pktl->pkt);
+ av_packet_unref(&pktl->pkt);
mp3->queue = pktl->next;
av_freep(&pktl);
}
return ret;
}
+static void mp3_update_xing(AVFormatContext *s)
+{
+ MP3Context *mp3 = s->priv_data;
+ AVReplayGain *rg;
+ uint16_t tag_crc;
+ uint8_t *toc;
+ int i, rg_size;
+
+ /* replace "Xing" identification string with "Info" for CBR files. */
+ if (!mp3->has_variable_bitrate)
+ AV_WL32(mp3->xing_frame + mp3->xing_offset, MKTAG('I', 'n', 'f', 'o'));
+
+ AV_WB32(mp3->xing_frame + mp3->xing_offset + 8, mp3->frames);
+ AV_WB32(mp3->xing_frame + mp3->xing_offset + 12, mp3->size);
+
+ toc = mp3->xing_frame + mp3->xing_offset + 16;
+ toc[0] = 0; // first toc entry has to be zero.
+ for (i = 1; i < XING_TOC_SIZE; ++i) {
+ int j = i * mp3->pos / XING_TOC_SIZE;
+ int seek_point = 256LL * mp3->bag[j] / mp3->size;
+ toc[i] = FFMIN(seek_point, 255);
+ }
+
+ /* write replaygain */
+ rg = (AVReplayGain*)av_stream_get_side_data(s->streams[0], AV_PKT_DATA_REPLAYGAIN,
+ &rg_size);
+ if (rg && rg_size >= sizeof(*rg)) {
+ uint16_t val;
+
+ AV_WB32(mp3->xing_frame + mp3->xing_offset + 131,
+ av_rescale(rg->track_peak, 1 << 23, 100000));
+
+ if (rg->track_gain != INT32_MIN) {
+ val = FFABS(rg->track_gain / 10000) & ((1 << 9) - 1);
+ val |= (rg->track_gain < 0) << 9;
+ val |= 1 << 13;
+ AV_WB16(mp3->xing_frame + mp3->xing_offset + 135, val);
+ }
+
+ if (rg->album_gain != INT32_MIN) {
+ val = FFABS(rg->album_gain / 10000) & ((1 << 9) - 1);
+ val |= (rg->album_gain < 0) << 9;
+ val |= 1 << 14;
+ AV_WB16(mp3->xing_frame + mp3->xing_offset + 137, val);
+ }
+ }
+
+ AV_WB32(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 8, mp3->audio_size);
+ AV_WB16(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 4, mp3->audio_crc);
+
+ tag_crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), 0, mp3->xing_frame, 190);
+ AV_WB16(mp3->xing_frame + mp3->xing_offset + XING_SIZE - 2, tag_crc);
+
+ avio_seek(s->pb, mp3->xing_frame_offset, SEEK_SET);
+ avio_write(s->pb, mp3->xing_frame, mp3->xing_frame_size);
+ avio_seek(s->pb, 0, SEEK_END);
+}
+
static int mp3_write_trailer(struct AVFormatContext *s)
{
uint8_t buf[ID3v1_TAG_SIZE];
MP3Context *mp3 = s->priv_data;
- if (mp3 && mp3->pics_to_write) {
+ if (mp3->pics_to_write) {
av_log(s, AV_LOG_WARNING, "No packets were sent for some of the "
"attached pictures.\n");
mp3_queue_flush(s);
}
/* write the id3v1 tag */
- if (mp3 && mp3->write_id3v1 && id3v1_create_tag(s, buf) > 0) {
+ if (mp3->write_id3v1 && id3v1_create_tag(s, buf) > 0) {
avio_write(s->pb, buf, ID3v1_TAG_SIZE);
}
- /* write number of frames */
- if (mp3 && mp3->nb_frames_offset) {
- avio_seek(s->pb, mp3->nb_frames_offset, SEEK_SET);
- avio_wb32(s->pb, s->streams[mp3->audio_stream_idx]->nb_frames);
- avio_seek(s->pb, 0, SEEK_END);
- }
+ if (mp3->xing_offset)
+ mp3_update_xing(s);
- avio_flush(s->pb);
+ av_freep(&mp3->xing_frame);
return 0;
}
-#if CONFIG_MP2_MUXER
-AVOutputFormat ff_mp2_muxer = {
- .name = "mp2",
- .long_name = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
- .mime_type = "audio/x-mpeg",
- .extensions = "mp2,m2a",
- .audio_codec = AV_CODEC_ID_MP2,
- .video_codec = AV_CODEC_ID_NONE,
- .write_packet = ff_raw_write_packet,
- .write_trailer = mp3_write_trailer,
-};
-#endif
-
-#if CONFIG_MP3_MUXER
-
static const AVOption options[] = {
{ "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",
- offsetof(MP3Context, id3v2_version), AV_OPT_TYPE_INT, {.i64 = 4}, 3, 4, AV_OPT_FLAG_ENCODING_PARAM},
+ offsetof(MP3Context, id3v2_version), AV_OPT_TYPE_INT, {.i64 = 4}, 0, 4, AV_OPT_FLAG_ENCODING_PARAM},
{ "write_id3v1", "Enable ID3v1 writing. ID3v1 tags are written in UTF-8 which may not be supported by most software.",
offsetof(MP3Context, write_id3v1), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
+ { "write_xing", "Write the Xing header containing file duration.",
+ offsetof(MP3Context, write_xing), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
{ NULL },
};
return AVERROR(ENOMEM);
pktl->pkt = *pkt;
- pkt->destruct = NULL;
+ pktl->pkt.buf = av_buffer_ref(pkt->buf);
+ if (!pktl->pkt.buf) {
+ av_freep(&pktl);
+ return AVERROR(ENOMEM);
+ }
if (mp3->queue_end)
mp3->queue_end->next = pktl;
mp3->queue = pktl;
mp3->queue_end = pktl;
} else
- return ff_raw_write_packet(s, pkt);
+ return mp3_write_audio_packet(s, pkt);
} else {
int ret;
MP3Context *mp3 = s->priv_data;
int ret, i;
+ if (mp3->id3v2_version &&
+ mp3->id3v2_version != 3 &&
+ mp3->id3v2_version != 4) {
+ av_log(s, AV_LOG_ERROR, "Invalid ID3v2 version requested: %d. Only "
+ "3, 4 or 0 (disabled) are allowed.\n", mp3->id3v2_version);
+ return AVERROR(EINVAL);
+ }
+
/* check the streams -- we want exactly one audio and arbitrary number of
* video (attached pictures) */
mp3->audio_stream_idx = -1;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
- if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
- if (mp3->audio_stream_idx >= 0 || st->codec->codec_id != AV_CODEC_ID_MP3) {
+ if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
+ if (mp3->audio_stream_idx >= 0 || st->codecpar->codec_id != AV_CODEC_ID_MP3) {
av_log(s, AV_LOG_ERROR, "Invalid audio stream. Exactly one MP3 "
"audio stream is required.\n");
return AVERROR(EINVAL);
}
mp3->audio_stream_idx = i;
- } else if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO) {
+ } else if (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
av_log(s, AV_LOG_ERROR, "Only audio streams and pictures are allowed in MP3.\n");
return AVERROR(EINVAL);
}
}
mp3->pics_to_write = s->nb_streams - 1;
- ff_id3v2_start(&mp3->id3, s->pb, mp3->id3v2_version, ID3v2_DEFAULT_MAGIC);
- ret = ff_id3v2_write_metadata(s, &mp3->id3);
- if (ret < 0)
- return ret;
+ if (mp3->pics_to_write && !mp3->id3v2_version) {
+ av_log(s, AV_LOG_ERROR, "Attached pictures were requested, but the "
+ "ID3v2 header is disabled.\n");
+ return AVERROR(EINVAL);
+ }
+
+ if (mp3->id3v2_version) {
+ ff_id3v2_start(&mp3->id3, s->pb, mp3->id3v2_version, ID3v2_DEFAULT_MAGIC);
+ ret = ff_id3v2_write_metadata(s, &mp3->id3);
+ if (ret < 0)
+ return ret;
+ }
if (!mp3->pics_to_write) {
- ff_id3v2_finish(&mp3->id3, s->pb);
+ if (mp3->id3v2_version)
+ ff_id3v2_finish(&mp3->id3, s->pb);
mp3_write_xing(s);
}
AVOutputFormat ff_mp3_muxer = {
.name = "mp3",
.long_name = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
- .mime_type = "audio/x-mpeg",
+ .mime_type = "audio/mpeg",
.extensions = "mp3",
.priv_data_size = sizeof(MP3Context),
.audio_codec = AV_CODEC_ID_MP3,
.flags = AVFMT_NOTIMESTAMPS,
.priv_class = &mp3_muxer_class,
};
-#endif
projects / ffmpeg / blobdiff