[FFmpeg-devel] [PATCH 2/5] Split mp3 demuxer and muxer into separate files.
Anton Khirnov
anton
Fri Jan 21 14:53:46 CET 2011
---
libavformat/Makefile | 6 +-
libavformat/mp3.c | 368 --------------------------------------------------
libavformat/mp3dec.c | 192 ++++++++++++++++++++++++++
libavformat/mp3enc.c | 194 ++++++++++++++++++++++++++
4 files changed, 389 insertions(+), 371 deletions(-)
delete mode 100644 libavformat/mp3.c
create mode 100644 libavformat/mp3dec.c
create mode 100644 libavformat/mp3enc.c
diff --git a/libavformat/Makefile b/libavformat/Makefile
index d3c849a..dd13bb4 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -129,9 +129,9 @@ OBJS-$(CONFIG_MMF_DEMUXER) += mmf.o pcm.o
OBJS-$(CONFIG_MMF_MUXER) += mmf.o riff.o
OBJS-$(CONFIG_MOV_DEMUXER) += mov.o riff.o isom.o
OBJS-$(CONFIG_MOV_MUXER) += movenc.o riff.o isom.o avc.o movenchint.o
-OBJS-$(CONFIG_MP2_MUXER) += mp3.o
-OBJS-$(CONFIG_MP3_DEMUXER) += mp3.o
-OBJS-$(CONFIG_MP3_MUXER) += mp3.o
+OBJS-$(CONFIG_MP2_MUXER) += mp3enc.o
+OBJS-$(CONFIG_MP3_DEMUXER) += mp3dec.o
+OBJS-$(CONFIG_MP3_MUXER) += mp3enc.o
OBJS-$(CONFIG_MPC_DEMUXER) += mpc.o apetag.o
OBJS-$(CONFIG_MPC8_DEMUXER) += mpc8.o
OBJS-$(CONFIG_MPEG1SYSTEM_MUXER) += mpegenc.o
diff --git a/libavformat/mp3.c b/libavformat/mp3.c
deleted file mode 100644
index e70a120..0000000
--- a/libavformat/mp3.c
+++ /dev/null
@@ -1,368 +0,0 @@
-/*
- * MP3 muxer and demuxer
- * Copyright (c) 2003 Fabrice Bellard
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <strings.h>
-#include "libavutil/avstring.h"
-#include "libavutil/intreadwrite.h"
-#include "avformat.h"
-#include "id3v2.h"
-#include "id3v1.h"
-
-#if CONFIG_MP3_DEMUXER
-
-#include "libavcodec/mpegaudio.h"
-#include "libavcodec/mpegaudiodecheader.h"
-
-/* mp3 read */
-
-static int mp3_read_probe(AVProbeData *p)
-{
- int max_frames, first_frames = 0;
- int fsize, frames, sample_rate;
- uint32_t header;
- uint8_t *buf, *buf0, *buf2, *end;
- AVCodecContext avctx;
-
- buf0 = p->buf;
- end = p->buf + p->buf_size - sizeof(uint32_t);
- while(buf0 < end && !*buf0)
- buf0++;
-
- max_frames = 0;
- buf = buf0;
-
- for(; buf < end; buf= buf2+1) {
- buf2 = buf;
-
- for(frames = 0; buf2 < end; frames++) {
- header = AV_RB32(buf2);
- fsize = ff_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate);
- if(fsize < 0)
- break;
- buf2 += fsize;
- }
- max_frames = FFMAX(max_frames, frames);
- if(buf == buf0)
- first_frames= frames;
- }
- // keep this in sync with ac3 probe, both need to avoid
- // issues with MPEG-files!
- if (first_frames>=4) return AVPROBE_SCORE_MAX/2+1;
- else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
- else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;
- else if(max_frames>=1) return 1;
- else return 0;
-//mpegps_mp3_unrecognized_format.mpg has max_frames=3
-}
-
-/**
- * Try to find Xing/Info/VBRI tags and compute duration from info therein
- */
-static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base)
-{
- uint32_t v, spf;
- unsigned frames = 0; /* Total number of frames in file */
- unsigned size = 0; /* Total number of bytes in the stream */
- const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
- MPADecodeHeader c;
- int vbrtag_size = 0;
-
- v = get_be32(s->pb);
- if(ff_mpa_check_header(v) < 0)
- return -1;
-
- if (ff_mpegaudio_decode_header(&c, v) == 0)
- vbrtag_size = c.frame_size;
- if(c.layer != 3)
- return -1;
-
- /* Check for Xing / Info tag */
- url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR);
- v = get_be32(s->pb);
- if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) {
- v = get_be32(s->pb);
- if(v & 0x1)
- frames = get_be32(s->pb);
- if(v & 0x2)
- size = get_be32(s->pb);
- }
-
- /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
- url_fseek(s->pb, base + 4 + 32, SEEK_SET);
- v = get_be32(s->pb);
- if(v == MKBETAG('V', 'B', 'R', 'I')) {
- /* Check tag version */
- if(get_be16(s->pb) == 1) {
- /* skip delay and quality */
- url_fseek(s->pb, 4, SEEK_CUR);
- frames = get_be32(s->pb);
- size = get_be32(s->pb);
- }
- }
-
- if(!frames && !size)
- return -1;
-
- /* Skip the vbr tag frame */
- url_fseek(s->pb, base + vbrtag_size, SEEK_SET);
-
- spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
- if(frames)
- st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
- st->time_base);
- if(size && frames)
- st->codec->bit_rate = av_rescale(size, 8 * c.sample_rate, frames * (int64_t)spf);
-
- return 0;
-}
-
-static int mp3_read_header(AVFormatContext *s,
- AVFormatParameters *ap)
-{
- AVStream *st;
- int64_t off;
-
- st = av_new_stream(s, 0);
- if (!st)
- return AVERROR(ENOMEM);
-
- st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- st->codec->codec_id = CODEC_ID_MP3;
- st->need_parsing = AVSTREAM_PARSE_FULL;
- st->start_time = 0;
-
- // lcm of all mp3 sample rates
- av_set_pts_info(st, 64, 1, 14112000);
-
- off = url_ftell(s->pb);
-
- if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
- ff_id3v1_read(s);
-
- if (mp3_parse_vbr_tags(s, st, off) < 0)
- url_fseek(s->pb, off, SEEK_SET);
-
- /* the parameters will be extracted from the compressed bitstream */
- return 0;
-}
-
-#define MP3_PACKET_SIZE 1024
-
-static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
-{
- int ret, size;
- // AVStream *st = s->streams[0];
-
- size= MP3_PACKET_SIZE;
-
- ret= av_get_packet(s->pb, pkt, size);
-
- pkt->stream_index = 0;
- if (ret <= 0) {
- return AVERROR(EIO);
- }
- /* note: we need to modify the packet size here to handle the last
- packet */
- pkt->size = ret;
- return ret;
-}
-
-AVInputFormat mp3_demuxer = {
- "mp3",
- NULL_IF_CONFIG_SMALL("MPEG audio layer 2/3"),
- 0,
- mp3_read_probe,
- mp3_read_header,
- mp3_read_packet,
- .flags= AVFMT_GENERIC_INDEX,
- .extensions = "mp2,mp3,m2a", /* XXX: use probe */
-};
-#endif
-
-#if CONFIG_MP2_MUXER || CONFIG_MP3_MUXER
-static int id3v1_set_string(AVFormatContext *s, const char *key,
- uint8_t *buf, int buf_size)
-{
- AVMetadataTag *tag;
- if ((tag = av_metadata_get(s->metadata, key, NULL, 0)))
- strncpy(buf, tag->value, buf_size);
- return !!tag;
-}
-
-static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
-{
- AVMetadataTag *tag;
- int i, count = 0;
-
- memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
- buf[0] = 'T';
- buf[1] = 'A';
- buf[2] = 'G';
- count += id3v1_set_string(s, "TIT2", buf + 3, 30); //title
- count += id3v1_set_string(s, "TPE1", buf + 33, 30); //author|artist
- count += id3v1_set_string(s, "TALB", buf + 63, 30); //album
- count += id3v1_set_string(s, "TDRL", buf + 93, 4); //date
- count += id3v1_set_string(s, "comment", buf + 97, 30);
- if ((tag = av_metadata_get(s->metadata, "TRCK", NULL, 0))) { //track
- buf[125] = 0;
- buf[126] = atoi(tag->value);
- count++;
- }
- buf[127] = 0xFF; /* default to unknown genre */
- if ((tag = av_metadata_get(s->metadata, "TCON", NULL, 0))) { //genre
- for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
- if (!strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
- buf[127] = i;
- count++;
- break;
- }
- }
- }
- return count;
-}
-
-/* simple formats */
-
-static void id3v2_put_size(AVFormatContext *s, int size)
-{
- put_byte(s->pb, size >> 21 & 0x7f);
- put_byte(s->pb, size >> 14 & 0x7f);
- put_byte(s->pb, size >> 7 & 0x7f);
- put_byte(s->pb, size & 0x7f);
-}
-
-static void id3v2_put_ttag(AVFormatContext *s, const char *buf, int len,
- uint32_t tag)
-{
- put_be32(s->pb, tag);
- id3v2_put_size(s, len + 1);
- put_be16(s->pb, 0);
- put_byte(s->pb, 3); /* UTF-8 */
- put_buffer(s->pb, buf, len);
-}
-
-
-static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
-{
- put_buffer(s->pb, pkt->data, pkt->size);
- put_flush_packet(s->pb);
- return 0;
-}
-
-static int mp3_write_trailer(struct AVFormatContext *s)
-{
- uint8_t buf[ID3v1_TAG_SIZE];
-
- /* write the id3v1 tag */
- if (id3v1_create_tag(s, buf) > 0) {
- put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
- put_flush_packet(s->pb);
- }
- return 0;
-}
-#endif /* CONFIG_MP2_MUXER || CONFIG_MP3_MUXER */
-
-#if CONFIG_MP2_MUXER
-AVOutputFormat mp2_muxer = {
- "mp2",
- NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
- "audio/x-mpeg",
- "mp2,m2a",
- 0,
- CODEC_ID_MP2,
- CODEC_ID_NONE,
- NULL,
- mp3_write_packet,
- mp3_write_trailer,
-};
-#endif
-
-#if CONFIG_MP3_MUXER
-/**
- * Write an ID3v2.4 header at beginning of stream
- */
-
-static int mp3_write_header(struct AVFormatContext *s)
-{
- AVMetadataTag *t = NULL;
- int totlen = 0;
- int64_t size_pos, cur_pos;
-
- put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
- put_byte(s->pb, 0);
- put_byte(s->pb, 0); /* flags */
-
- /* reserve space for size */
- size_pos = url_ftell(s->pb);
- put_be32(s->pb, 0);
-
- ff_metadata_conv(&s->metadata, ff_id3v2_metadata_conv, NULL);
- while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) {
- uint32_t tag = 0;
-
- if (t->key[0] == 'T' && strlen(t->key) == 4) {
- int i;
- for (i = 0; *ff_id3v2_tags[i]; i++)
- if (AV_RB32(t->key) == AV_RB32(ff_id3v2_tags[i])) {
- int len = strlen(t->value);
- tag = AV_RB32(t->key);
- totlen += len + ID3v2_HEADER_SIZE + 2;
- id3v2_put_ttag(s, t->value, len + 1, tag);
- break;
- }
- }
-
- if (!tag) { /* unknown tag, write as TXXX frame */
- int len = strlen(t->key), len1 = strlen(t->value);
- char *buf = av_malloc(len + len1 + 2);
- if (!buf)
- return AVERROR(ENOMEM);
- tag = MKBETAG('T', 'X', 'X', 'X');
- strcpy(buf, t->key);
- strcpy(buf + len + 1, t->value);
- id3v2_put_ttag(s, buf, len + len1 + 2, tag);
- totlen += len + len1 + ID3v2_HEADER_SIZE + 3;
- av_free(buf);
- }
- }
-
- cur_pos = url_ftell(s->pb);
- url_fseek(s->pb, size_pos, SEEK_SET);
- id3v2_put_size(s, totlen);
- url_fseek(s->pb, cur_pos, SEEK_SET);
-
- return 0;
-}
-
-AVOutputFormat mp3_muxer = {
- "mp3",
- NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
- "audio/x-mpeg",
- "mp3",
- 0,
- CODEC_ID_MP3,
- CODEC_ID_NONE,
- mp3_write_header,
- mp3_write_packet,
- mp3_write_trailer,
- AVFMT_NOTIMESTAMPS,
-};
-#endif
diff --git a/libavformat/mp3dec.c b/libavformat/mp3dec.c
new file mode 100644
index 0000000..ab6aabe
--- /dev/null
+++ b/libavformat/mp3dec.c
@@ -0,0 +1,192 @@
+/*
+ * MP3 demuxer
+ * Copyright (c) 2003 Fabrice Bellard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/avstring.h"
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "id3v2.h"
+#include "id3v1.h"
+#include "libavcodec/mpegaudiodecheader.h"
+
+/* mp3 read */
+
+static int mp3_read_probe(AVProbeData *p)
+{
+ int max_frames, first_frames = 0;
+ int fsize, frames, sample_rate;
+ uint32_t header;
+ uint8_t *buf, *buf0, *buf2, *end;
+ AVCodecContext avctx;
+
+ buf0 = p->buf;
+ end = p->buf + p->buf_size - sizeof(uint32_t);
+ while(buf0 < end && !*buf0)
+ buf0++;
+
+ max_frames = 0;
+ buf = buf0;
+
+ for(; buf < end; buf= buf2+1) {
+ buf2 = buf;
+
+ for(frames = 0; buf2 < end; frames++) {
+ header = AV_RB32(buf2);
+ fsize = ff_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate);
+ if(fsize < 0)
+ break;
+ buf2 += fsize;
+ }
+ max_frames = FFMAX(max_frames, frames);
+ if(buf == buf0)
+ first_frames= frames;
+ }
+ // keep this in sync with ac3 probe, both need to avoid
+ // issues with MPEG-files!
+ if (first_frames>=4) return AVPROBE_SCORE_MAX/2+1;
+ else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
+ else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;
+ else if(max_frames>=1) return 1;
+ else return 0;
+//mpegps_mp3_unrecognized_format.mpg has max_frames=3
+}
+
+/**
+ * Try to find Xing/Info/VBRI tags and compute duration from info therein
+ */
+static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base)
+{
+ uint32_t v, spf;
+ unsigned frames = 0; /* Total number of frames in file */
+ unsigned size = 0; /* Total number of bytes in the stream */
+ const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
+ MPADecodeHeader c;
+ int vbrtag_size = 0;
+
+ v = get_be32(s->pb);
+ if(ff_mpa_check_header(v) < 0)
+ return -1;
+
+ if (ff_mpegaudio_decode_header(&c, v) == 0)
+ vbrtag_size = c.frame_size;
+ if(c.layer != 3)
+ return -1;
+
+ /* Check for Xing / Info tag */
+ url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR);
+ v = get_be32(s->pb);
+ if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) {
+ v = get_be32(s->pb);
+ if(v & 0x1)
+ frames = get_be32(s->pb);
+ if(v & 0x2)
+ size = get_be32(s->pb);
+ }
+
+ /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
+ url_fseek(s->pb, base + 4 + 32, SEEK_SET);
+ v = get_be32(s->pb);
+ if(v == MKBETAG('V', 'B', 'R', 'I')) {
+ /* Check tag version */
+ if(get_be16(s->pb) == 1) {
+ /* skip delay and quality */
+ url_fseek(s->pb, 4, SEEK_CUR);
+ frames = get_be32(s->pb);
+ size = get_be32(s->pb);
+ }
+ }
+
+ if(!frames && !size)
+ return -1;
+
+ /* Skip the vbr tag frame */
+ url_fseek(s->pb, base + vbrtag_size, SEEK_SET);
+
+ spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
+ if(frames)
+ st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
+ st->time_base);
+ if(size && frames)
+ st->codec->bit_rate = av_rescale(size, 8 * c.sample_rate, frames * (int64_t)spf);
+
+ return 0;
+}
+
+static int mp3_read_header(AVFormatContext *s,
+ AVFormatParameters *ap)
+{
+ AVStream *st;
+ int64_t off;
+
+ st = av_new_stream(s, 0);
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codec->codec_id = CODEC_ID_MP3;
+ st->need_parsing = AVSTREAM_PARSE_FULL;
+ st->start_time = 0;
+
+ // lcm of all mp3 sample rates
+ av_set_pts_info(st, 64, 1, 14112000);
+
+ off = url_ftell(s->pb);
+
+ if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
+ ff_id3v1_read(s);
+
+ if (mp3_parse_vbr_tags(s, st, off) < 0)
+ url_fseek(s->pb, off, SEEK_SET);
+
+ /* the parameters will be extracted from the compressed bitstream */
+ return 0;
+}
+
+#define MP3_PACKET_SIZE 1024
+
+static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ int ret, size;
+ // AVStream *st = s->streams[0];
+
+ size= MP3_PACKET_SIZE;
+
+ ret= av_get_packet(s->pb, pkt, size);
+
+ pkt->stream_index = 0;
+ if (ret <= 0) {
+ return AVERROR(EIO);
+ }
+ /* note: we need to modify the packet size here to handle the last
+ packet */
+ pkt->size = ret;
+ return ret;
+}
+
+AVInputFormat mp3_demuxer = {
+ "mp3",
+ NULL_IF_CONFIG_SMALL("MPEG audio layer 2/3"),
+ 0,
+ mp3_read_probe,
+ mp3_read_header,
+ mp3_read_packet,
+ .flags= AVFMT_GENERIC_INDEX,
+ .extensions = "mp2,mp3,m2a", /* XXX: use probe */
+};
diff --git a/libavformat/mp3enc.c b/libavformat/mp3enc.c
new file mode 100644
index 0000000..b4fb876
--- /dev/null
+++ b/libavformat/mp3enc.c
@@ -0,0 +1,194 @@
+/*
+ * MP3 muxer
+ * Copyright (c) 2003 Fabrice Bellard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <strings.h>
+#include "avformat.h"
+#include "id3v1.h"
+#include "id3v2.h"
+#include "libavutil/intreadwrite.h"
+
+static int id3v1_set_string(AVFormatContext *s, const char *key,
+ uint8_t *buf, int buf_size)
+{
+ AVMetadataTag *tag;
+ if ((tag = av_metadata_get(s->metadata, key, NULL, 0)))
+ strncpy(buf, tag->value, buf_size);
+ return !!tag;
+}
+
+static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
+{
+ AVMetadataTag *tag;
+ int i, count = 0;
+
+ memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
+ buf[0] = 'T';
+ buf[1] = 'A';
+ buf[2] = 'G';
+ count += id3v1_set_string(s, "TIT2", buf + 3, 30); //title
+ count += id3v1_set_string(s, "TPE1", buf + 33, 30); //author|artist
+ count += id3v1_set_string(s, "TALB", buf + 63, 30); //album
+ count += id3v1_set_string(s, "TDRL", buf + 93, 4); //date
+ count += id3v1_set_string(s, "comment", buf + 97, 30);
+ if ((tag = av_metadata_get(s->metadata, "TRCK", NULL, 0))) { //track
+ buf[125] = 0;
+ buf[126] = atoi(tag->value);
+ count++;
+ }
+ buf[127] = 0xFF; /* default to unknown genre */
+ if ((tag = av_metadata_get(s->metadata, "TCON", NULL, 0))) { //genre
+ for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
+ if (!strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
+ buf[127] = i;
+ count++;
+ break;
+ }
+ }
+ }
+ return count;
+}
+
+/* simple formats */
+
+static void id3v2_put_size(AVFormatContext *s, int size)
+{
+ put_byte(s->pb, size >> 21 & 0x7f);
+ put_byte(s->pb, size >> 14 & 0x7f);
+ put_byte(s->pb, size >> 7 & 0x7f);
+ put_byte(s->pb, size & 0x7f);
+}
+
+static void id3v2_put_ttag(AVFormatContext *s, const char *buf, int len,
+ uint32_t tag)
+{
+ put_be32(s->pb, tag);
+ id3v2_put_size(s, len + 1);
+ put_be16(s->pb, 0);
+ put_byte(s->pb, 3); /* UTF-8 */
+ put_buffer(s->pb, buf, len);
+}
+
+
+static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
+{
+ put_buffer(s->pb, pkt->data, pkt->size);
+ put_flush_packet(s->pb);
+ return 0;
+}
+
+static int mp3_write_trailer(struct AVFormatContext *s)
+{
+ uint8_t buf[ID3v1_TAG_SIZE];
+
+ /* write the id3v1 tag */
+ if (id3v1_create_tag(s, buf) > 0) {
+ put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
+ put_flush_packet(s->pb);
+ }
+ return 0;
+}
+
+#if CONFIG_MP2_MUXER
+AVOutputFormat mp2_muxer = {
+ "mp2",
+ NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
+ "audio/x-mpeg",
+ "mp2,m2a",
+ 0,
+ CODEC_ID_MP2,
+ CODEC_ID_NONE,
+ NULL,
+ mp3_write_packet,
+ mp3_write_trailer,
+};
+#endif
+
+#if CONFIG_MP3_MUXER
+/**
+ * Write an ID3v2.4 header at beginning of stream
+ */
+
+static int mp3_write_header(struct AVFormatContext *s)
+{
+ AVMetadataTag *t = NULL;
+ int totlen = 0;
+ int64_t size_pos, cur_pos;
+
+ put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
+ put_byte(s->pb, 0);
+ put_byte(s->pb, 0); /* flags */
+
+ /* reserve space for size */
+ size_pos = url_ftell(s->pb);
+ put_be32(s->pb, 0);
+
+ ff_metadata_conv(&s->metadata, ff_id3v2_metadata_conv, NULL);
+ while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) {
+ uint32_t tag = 0;
+
+ if (t->key[0] == 'T' && strlen(t->key) == 4) {
+ int i;
+ for (i = 0; *ff_id3v2_tags[i]; i++)
+ if (AV_RB32(t->key) == AV_RB32(ff_id3v2_tags[i])) {
+ int len = strlen(t->value);
+ tag = AV_RB32(t->key);
+ totlen += len + ID3v2_HEADER_SIZE + 2;
+ id3v2_put_ttag(s, t->value, len + 1, tag);
+ break;
+ }
+ }
+
+ if (!tag) { /* unknown tag, write as TXXX frame */
+ int len = strlen(t->key), len1 = strlen(t->value);
+ char *buf = av_malloc(len + len1 + 2);
+ if (!buf)
+ return AVERROR(ENOMEM);
+ tag = MKBETAG('T', 'X', 'X', 'X');
+ strcpy(buf, t->key);
+ strcpy(buf + len + 1, t->value);
+ id3v2_put_ttag(s, buf, len + len1 + 2, tag);
+ totlen += len + len1 + ID3v2_HEADER_SIZE + 3;
+ av_free(buf);
+ }
+ }
+
+ cur_pos = url_ftell(s->pb);
+ url_fseek(s->pb, size_pos, SEEK_SET);
+ id3v2_put_size(s, totlen);
+ url_fseek(s->pb, cur_pos, SEEK_SET);
+
+ return 0;
+}
+
+AVOutputFormat mp3_muxer = {
+ "mp3",
+ NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
+ "audio/x-mpeg",
+ "mp3",
+ 0,
+ CODEC_ID_MP3,
+ CODEC_ID_NONE,
+ mp3_write_header,
+ mp3_write_packet,
+ mp3_write_trailer,
+ AVFMT_NOTIMESTAMPS,
+};
+#endif
--
1.7.2.3
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