* MP3 demuxer
* Copyright (c) 2003 Fabrice Bellard
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; 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 "libavutil/dict.h"
+#include "libavutil/mathematics.h"
#include "avformat.h"
+#include "internal.h"
#include "id3v2.h"
#include "id3v1.h"
#include "libavcodec/mpegaudiodecheader.h"
+#define XING_FLAG_FRAMES 0x01
+#define XING_FLAG_SIZE 0x02
+#define XING_FLAG_TOC 0x04
+
+#define XING_TOC_COUNT 100
+
/* mp3 read */
static int mp3_read_probe(AVProbeData *p)
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);
+ fsize = avpriv_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate);
if(fsize < 0)
break;
buf2 += fsize;
}
// 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;
+ if (first_frames >= 4) return AVPROBE_SCORE_MAX / 2 + 1;
+
+ if (max_frames) {
+ int pes = 0, i;
+ unsigned int code = -1;
+
+#define VIDEO_ID 0x000001e0
+#define AUDIO_ID 0x000001c0
+ /* do a search for mpegps headers to be able to properly bias
+ * towards mpegps if we detect this stream as both. */
+ for (i = 0; i<p->buf_size; i++) {
+ code = (code << 8) + p->buf[i];
+ if ((code & 0xffffff00) == 0x100) {
+ if ((code & 0x1f0) == VIDEO_ID) pes++;
+ else if((code & 0x1e0) == AUDIO_ID) pes++;
+ }
+ }
+
+ if (pes)
+ max_frames = (max_frames + pes - 1) / pes;
+ }
+ 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
}
+static void read_xing_toc(AVFormatContext *s, int64_t filesize, int64_t duration)
+{
+ int i;
+
+ if (!filesize &&
+ !(filesize = avio_size(s->pb))) {
+ av_log(s, AV_LOG_WARNING, "Cannot determine file size, skipping TOC table.\n");
+ return;
+ }
+
+ for (i = 0; i < XING_TOC_COUNT; i++) {
+ uint8_t b = avio_r8(s->pb);
+
+ av_add_index_entry(s->streams[0],
+ av_rescale(b, filesize, 256),
+ av_rescale(i, duration, XING_TOC_COUNT),
+ 0, 0, AVINDEX_KEYFRAME);
+ }
+}
+
/**
* Try to find Xing/Info/VBRI tags and compute duration from info therein
*/
if(ff_mpa_check_header(v) < 0)
return -1;
- if (ff_mpegaudio_decode_header(&c, v) == 0)
+ if (avpriv_mpegaudio_decode_header(&c, v) == 0)
vbrtag_size = c.frame_size;
if(c.layer != 3)
return -1;
+ spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
+
/* Check for Xing / Info tag */
- avio_seek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR);
+ avio_skip(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1]);
v = avio_rb32(s->pb);
if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) {
v = avio_rb32(s->pb);
- if(v & 0x1)
+ if(v & XING_FLAG_FRAMES)
frames = avio_rb32(s->pb);
- if(v & 0x2)
+ if(v & XING_FLAG_SIZE)
size = avio_rb32(s->pb);
+ if (v & XING_FLAG_TOC && frames)
+ read_xing_toc(s, size, av_rescale_q(frames, (AVRational){spf, c.sample_rate},
+ st->time_base));
}
/* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
if(avio_rb16(s->pb) == 1) {
/* skip delay and quality */
avio_skip(s->pb, 4);
- frames = avio_rb32(s->pb);
size = avio_rb32(s->pb);
+ frames = avio_rb32(s->pb);
}
}
/* Skip the vbr tag frame */
avio_seek(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);
return 0;
}
-static int mp3_read_header(AVFormatContext *s,
- AVFormatParameters *ap)
+static int mp3_read_header(AVFormatContext *s)
{
AVStream *st;
int64_t off;
- st = av_new_stream(s, 0);
+ st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- st->codec->codec_id = CODEC_ID_MP3;
+ st->codec->codec_id = AV_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);
+ avpriv_set_pts_info(st, 64, 1, 14112000);
off = avio_tell(s->pb);
- if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
+ if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
ff_id3v1_read(s);
if (mp3_parse_vbr_tags(s, st, off) < 0)
static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
{
- int ret, size;
- // AVStream *st = s->streams[0];
-
- size= MP3_PACKET_SIZE;
+ int ret;
- ret= av_get_packet(s->pb, pkt, size);
+ ret = av_get_packet(s->pb, pkt, MP3_PACKET_SIZE);
+ if (ret < 0)
+ return ret;
pkt->stream_index = 0;
- if (ret <= 0) {
- return AVERROR(EIO);
- }
if (ret > ID3v1_TAG_SIZE &&
memcmp(&pkt->data[ret - ID3v1_TAG_SIZE], "TAG", 3) == 0)
return ret;
}
+static int mp3_seek(AVFormatContext *s, int stream_index, int64_t timestamp,
+ int flags)
+{
+ AVIndexEntry *ie;
+ AVStream *st = s->streams[0];
+ int64_t ret = av_index_search_timestamp(st, timestamp, flags);
+ uint32_t header = 0;
+
+ if (ret < 0)
+ return ret;
+
+ ie = &st->index_entries[ret];
+ ret = avio_seek(s->pb, ie->pos, SEEK_SET);
+ if (ret < 0)
+ return ret;
+
+ while (!s->pb->eof_reached) {
+ header = (header << 8) + avio_r8(s->pb);
+ if (ff_mpa_check_header(header) >= 0) {
+ ff_update_cur_dts(s, st, ie->timestamp);
+ ret = avio_seek(s->pb, -4, SEEK_CUR);
+ return (ret >= 0) ? 0 : ret;
+ }
+ }
+
+ return AVERROR_EOF;
+}
+
AVInputFormat ff_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 */
+ .name = "mp3",
+ .long_name = NULL_IF_CONFIG_SMALL("MP2/3 (MPEG audio layer 2/3)"),
+ .read_probe = mp3_read_probe,
+ .read_header = mp3_read_header,
+ .read_packet = mp3_read_packet,
+ .read_seek = mp3_seek,
+ .flags = AVFMT_GENERIC_INDEX,
+ .extensions = "mp2,mp3,m2a", /* XXX: use probe */
};
projects / ffmpeg / blobdiff