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https://github.com/FFmpeg/FFmpeg.git
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Merge commit '32d05934abc7427bb90380a4c1ab20a15fd7d821'
* commit '32d05934abc7427bb90380a4c1ab20a15fd7d821': mp3dec: decode more data from Info header Conflicts: libavformat/mp3dec.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
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commit
cdc166acd8
@ -105,6 +105,8 @@ void ffio_init_checksum(AVIOContext *s,
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unsigned long ffio_get_checksum(AVIOContext *s);
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unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
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unsigned int len);
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unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
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unsigned int len);
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/**
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* Open a write only packetized memory stream with a maximum packet
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@ -469,6 +469,12 @@ unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
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return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
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}
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unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
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unsigned int len)
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{
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return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
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}
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unsigned long ffio_get_checksum(AVIOContext *s)
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{
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s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
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@ -22,10 +22,12 @@
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#include "libavutil/opt.h"
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#include "libavutil/avstring.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/crc.h"
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#include "libavutil/dict.h"
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#include "libavutil/mathematics.h"
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#include "avformat.h"
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#include "internal.h"
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#include "avio_internal.h"
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#include "id3v2.h"
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#include "id3v1.h"
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#include "replaygain.h"
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@ -120,11 +122,20 @@ static void read_xing_toc(AVFormatContext *s, int64_t filesize, int64_t duration
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mp3->xing_toc = 1;
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}
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static void mp3_parse_info_tag(AVFormatContext *s, AVStream *st,
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MPADecodeHeader *c, uint32_t spf)
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{
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#define LAST_BITS(k, n) ((k) & ((1 << (n)) - 1))
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#define MIDDLE_BITS(k, m, n) LAST_BITS((k) >> (m), ((n) - (m)))
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uint16_t crc;
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uint32_t v;
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char version[10];
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uint32_t peak = 0;
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int32_t r_gain = INT32_MIN, a_gain = INT32_MIN;
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MP3DecContext *mp3 = s->priv_data;
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static const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
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@ -132,33 +143,99 @@ static void mp3_parse_info_tag(AVFormatContext *s, AVStream *st,
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avio_skip(s->pb, xing_offtbl[c->lsf == 1][c->nb_channels == 1]);
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v = avio_rb32(s->pb);
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mp3->is_cbr = v == MKBETAG('I', 'n', 'f', 'o');
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if (v == MKBETAG('X', 'i', 'n', 'g') || mp3->is_cbr) {
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v = avio_rb32(s->pb);
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if (v & XING_FLAG_FRAMES)
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mp3->frames = avio_rb32(s->pb);
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if (v & XING_FLAG_SIZE)
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mp3->header_filesize = avio_rb32(s->pb);
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if (v & XING_FLAG_TOC)
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read_xing_toc(s, mp3->header_filesize,
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av_rescale_q(mp3->frames,
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if (v != MKBETAG('X', 'i', 'n', 'g') && !mp3->is_cbr)
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return;
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v = avio_rb32(s->pb);
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if (v & XING_FLAG_FRAMES)
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mp3->frames = avio_rb32(s->pb);
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if (v & XING_FLAG_SIZE)
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mp3->header_filesize = avio_rb32(s->pb);
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if (v & XING_FLAG_TOC)
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read_xing_toc(s, mp3->header_filesize, av_rescale_q(mp3->frames,
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(AVRational){spf, c->sample_rate},
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st->time_base));
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if(v & 8)
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avio_skip(s->pb, 4);
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/* VBR quality */
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if(v & 8)
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avio_skip(s->pb, 4);
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v = avio_rb32(s->pb);
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if(v == MKBETAG('L', 'A', 'M', 'E') || v == MKBETAG('L', 'a', 'v', 'f')) {
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avio_skip(s->pb, 21-4);
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v= avio_rb24(s->pb);
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mp3->start_pad = v>>12;
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mp3-> end_pad = v&4095;
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st->skip_samples = mp3->start_pad + 528 + 1;
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if (!st->start_time)
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st->start_time = av_rescale_q(st->skip_samples,
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(AVRational){1, c->sample_rate},
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st->time_base);
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av_log(s, AV_LOG_DEBUG, "pad %d %d\n", mp3->start_pad, mp3-> end_pad);
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}
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/* Encoder short version string */
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memset(version, 0, sizeof(version));
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avio_read(s->pb, version, 9);
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/* Info Tag revision + VBR method */
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avio_r8(s->pb);
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/* Lowpass filter value */
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avio_r8(s->pb);
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/* ReplayGain peak */
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v = avio_rb32(s->pb);
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peak = av_rescale(v, 100000, 1 << 23);
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/* Radio ReplayGain */
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v = avio_rb16(s->pb);
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if (MIDDLE_BITS(v, 13, 15) == 1) {
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r_gain = MIDDLE_BITS(v, 0, 8) * 10000;
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if (v & (1 << 9))
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r_gain *= -1;
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}
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/* Audiophile ReplayGain */
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v = avio_rb16(s->pb);
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if (MIDDLE_BITS(v, 13, 15) == 2) {
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a_gain = MIDDLE_BITS(v, 0, 8) * 10000;
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if (v & (1 << 9))
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a_gain *= -1;
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}
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/* Encoding flags + ATH Type */
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avio_r8(s->pb);
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/* if ABR {specified bitrate} else {minimal bitrate} */
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avio_r8(s->pb);
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/* Encoder delays */
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v= avio_rb24(s->pb);
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if(AV_RB32(version) == MKBETAG('L', 'A', 'M', 'E')
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|| AV_RB32(version) == MKBETAG('L', 'a', 'v', 'f')) {
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mp3->start_pad = v>>12;
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mp3-> end_pad = v&4095;
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st->skip_samples = mp3->start_pad + 528 + 1;
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if (!st->start_time)
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st->start_time = av_rescale_q(st->skip_samples,
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(AVRational){1, c->sample_rate},
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st->time_base);
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av_log(s, AV_LOG_DEBUG, "pad %d %d\n", mp3->start_pad, mp3-> end_pad);
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}
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/* Misc */
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avio_r8(s->pb);
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/* MP3 gain */
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avio_r8(s->pb);
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/* Preset and surround info */
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avio_rb16(s->pb);
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/* Music length */
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avio_rb32(s->pb);
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/* Music CRC */
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avio_rb16(s->pb);
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/* Info Tag CRC */
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crc = ffio_get_checksum(s->pb);
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v = avio_rb16(s->pb);
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if (v == crc) {
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ff_replaygain_export_raw(st, r_gain, peak, a_gain, 0);
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av_dict_set(&st->metadata, "encoder", version, 0);
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}
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}
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@ -191,6 +268,8 @@ static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base)
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int vbrtag_size = 0;
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MP3DecContext *mp3 = s->priv_data;
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ffio_init_checksum(s->pb, ff_crcA001_update, 0);
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v = avio_rb32(s->pb);
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if(ff_mpa_check_header(v) < 0)
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return -1;
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