#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
+#include "libavutil/crc.h"
#include "libavutil/dict.h"
#include "libavutil/mathematics.h"
#include "avformat.h"
#include "internal.h"
+#include "avio_internal.h"
#include "id3v2.h"
#include "id3v1.h"
+#include "replaygain.h"
+
#include "libavcodec/mpegaudiodecheader.h"
#define XING_FLAG_FRAMES 0x01
typedef struct MP3DecContext {
int xing_toc;
+ unsigned frames; /* Total number of frames in file */
+ unsigned size; /* Total number of bytes in the stream */
+ int is_cbr;
} MP3DecContext;
/* mp3 read */
}
// 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;
+ if (first_frames >= 4) return AVPROBE_SCORE_EXTENSION + 1;
if (max_frames) {
int pes = 0, i;
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;
+ if (max_frames > 500) return AVPROBE_SCORE_EXTENSION;
+ else if (max_frames >= 4) return AVPROBE_SCORE_EXTENSION / 2;
else if (max_frames >= 1) return 1;
else return 0;
//mpegps_mp3_unrecognized_format.mpg has max_frames=3
mp3->xing_toc = 1;
}
+static void mp3_parse_info_tag(AVFormatContext *s, AVStream *st,
+ MPADecodeHeader *c, uint32_t spf)
+{
+#define LAST_BITS(k, n) ((k) & ((1 << (n)) - 1))
+#define MIDDLE_BITS(k, m, n) LAST_BITS((k) >> (m), ((n) - (m)))
+
+ uint16_t crc;
+ uint32_t v;
+
+ char version[10];
+
+ uint32_t peak = 0;
+ int32_t r_gain = INT32_MIN, a_gain = INT32_MIN;
+
+ MP3DecContext *mp3 = s->priv_data;
+ const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
+
+ /* Check for Xing / Info tag */
+ avio_skip(s->pb, xing_offtbl[c->lsf == 1][c->nb_channels == 1]);
+ v = avio_rb32(s->pb);
+ mp3->is_cbr = v == MKBETAG('I', 'n', 'f', 'o');
+ if (v != MKBETAG('X', 'i', 'n', 'g') && !mp3->is_cbr)
+ return;
+
+ v = avio_rb32(s->pb);
+ if (v & XING_FLAG_FRAMES)
+ mp3->frames = avio_rb32(s->pb);
+ if (v & XING_FLAG_SIZE)
+ mp3->size = avio_rb32(s->pb);
+ if (v & XING_FLAG_TOC && mp3->frames)
+ read_xing_toc(s, mp3->size, av_rescale_q(mp3->frames,
+ (AVRational){spf, c->sample_rate},
+ st->time_base));
+
+ /* VBR quality */
+ avio_rb32(s->pb);
+
+ /* Encoder short version string */
+ memset(version, 0, sizeof(version));
+ avio_read(s->pb, version, 9);
+
+ /* Info Tag revision + VBR method */
+ avio_r8(s->pb);
+
+ /* Lowpass filter value */
+ avio_r8(s->pb);
+
+ /* ReplayGain peak */
+ v = avio_rb32(s->pb);
+ peak = av_rescale(v, 100000, 1 << 23);
+
+ /* Radio ReplayGain */
+ v = avio_rb16(s->pb);
+
+ if (MIDDLE_BITS(v, 13, 15) == 1) {
+ r_gain = MIDDLE_BITS(v, 0, 8) * 10000;
+
+ if (v & (1 << 9))
+ r_gain *= -1;
+ }
+
+ /* Audiophile ReplayGain */
+ v = avio_rb16(s->pb);
+
+ if (MIDDLE_BITS(v, 13, 15) == 2) {
+ a_gain = MIDDLE_BITS(v, 0, 8) * 10000;
+
+ if (v & (1 << 9))
+ a_gain *= -1;
+ }
+
+ /* Encoding flags + ATH Type */
+ avio_r8(s->pb);
+
+ /* if ABR {specified bitrate} else {minimal bitrate} */
+ avio_r8(s->pb);
+
+ /* Encoder delays */
+ avio_rb24(s->pb);
+
+ /* Misc */
+ avio_r8(s->pb);
+
+ /* MP3 gain */
+ avio_r8(s->pb);
+
+ /* Preset and surround info */
+ avio_rb16(s->pb);
+
+ /* Music length */
+ avio_rb32(s->pb);
+
+ /* Music CRC */
+ avio_rb16(s->pb);
+
+ /* Info Tag CRC */
+ crc = ffio_get_checksum(s->pb);
+ v = avio_rb16(s->pb);
+
+ if (v == crc) {
+ ff_replaygain_export_raw(st, r_gain, peak, a_gain, 0);
+ av_dict_set(&st->metadata, "encoder", version, 0);
+ }
+}
+
+static void mp3_parse_vbri_tag(AVFormatContext *s, AVStream *st, int64_t base)
+{
+ uint32_t v;
+ MP3DecContext *mp3 = s->priv_data;
+
+ /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
+ avio_seek(s->pb, base + 4 + 32, SEEK_SET);
+ v = avio_rb32(s->pb);
+ if (v == MKBETAG('V', 'B', 'R', 'I')) {
+ /* Check tag version */
+ if (avio_rb16(s->pb) == 1) {
+ /* skip delay and quality */
+ avio_skip(s->pb, 4);
+ mp3->size = avio_rb32(s->pb);
+ mp3->frames = avio_rb32(s->pb);
+ }
+ }
+}
+
/**
* 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;
- int is_cbr;
+ MP3DecContext *mp3 = s->priv_data;
+
+ ffio_init_checksum(s->pb, ff_crcA001_update, 0);
v = avio_rb32(s->pb);
if(ff_mpa_check_header(v) < 0)
spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
- /* Check for Xing / Info tag */
- avio_skip(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1]);
- v = avio_rb32(s->pb);
- is_cbr = v == MKBETAG('I', 'n', 'f', 'o');
- if (v == MKBETAG('X', 'i', 'n', 'g') || is_cbr) {
- v = avio_rb32(s->pb);
- if(v & XING_FLAG_FRAMES)
- frames = avio_rb32(s->pb);
- 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));
- }
+ mp3->frames = 0;
+ mp3->size = 0;
- /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
- avio_seek(s->pb, base + 4 + 32, SEEK_SET);
- v = avio_rb32(s->pb);
- if(v == MKBETAG('V', 'B', 'R', 'I')) {
- /* Check tag version */
- if(avio_rb16(s->pb) == 1) {
- /* skip delay and quality */
- avio_skip(s->pb, 4);
- size = avio_rb32(s->pb);
- frames = avio_rb32(s->pb);
- }
- }
+ mp3_parse_info_tag(s, st, &c, spf);
+ mp3_parse_vbri_tag(s, st, base);
- if(!frames && !size)
+ if (!mp3->frames && !mp3->size)
return -1;
/* Skip the vbr tag frame */
avio_seek(s->pb, base + vbrtag_size, SEEK_SET);
- if(frames)
- st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
+ if (mp3->frames)
+ st->duration = av_rescale_q(mp3->frames, (AVRational){spf, c.sample_rate},
st->time_base);
- if (size && frames && !is_cbr)
- st->codec->bit_rate = av_rescale(size, 8 * c.sample_rate, frames * (int64_t)spf);
+ if (mp3->size && mp3->frames && !mp3->is_cbr)
+ st->codec->bit_rate = av_rescale(mp3->size, 8 * c.sample_rate, mp3->frames * (int64_t)spf);
return 0;
}
{
AVStream *st;
int64_t off;
+ int ret;
st = avformat_new_stream(s, NULL);
if (!st)
if (mp3_parse_vbr_tags(s, st, off) < 0)
avio_seek(s->pb, off, SEEK_SET);
+ ret = ff_replaygain_export(st, s->metadata);
+ if (ret < 0)
+ return ret;
+
/* the parameters will be extracted from the compressed bitstream */
return 0;
}
.read_seek = mp3_seek,
.priv_data_size = sizeof(MP3DecContext),
.flags = AVFMT_GENERIC_INDEX,
- .extensions = "mp2,mp3,m2a", /* XXX: use probe */
+ .extensions = "mp2,mp3,m2a,mpa", /* XXX: use probe */
};
projects / ffmpeg / blobdiff