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minimp3_ex.h
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minimp3_ex.h
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#ifndef MINIMP3_EXT_H
#define MINIMP3_EXT_H
/*
https://github.com/lieff/minimp3
To the extent possible under law, the author(s) have dedicated all copyright and related and neighboring rights to this software to the public ___domain worldwide.
This software is distributed without any warranty.
See <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
#include <stddef.h>
#include "minimp3.h"
/* flags for mp3dec_ex_open_* functions */
#define MP3D_SEEK_TO_BYTE 0 /* mp3dec_ex_seek seeks to byte in stream */
#define MP3D_SEEK_TO_SAMPLE 1 /* mp3dec_ex_seek precisely seeks to sample using index (created during duration calculation scan or when mp3dec_ex_seek called) */
#define MP3D_DO_NOT_SCAN 2 /* do not scan whole stream for duration if vbrtag not found, mp3dec_ex_t::samples will be filled only if mp3dec_ex_t::vbr_tag_found == 1 */
#ifdef MINIMP3_ALLOW_MONO_STEREO_TRANSITION
#define MP3D_ALLOW_MONO_STEREO_TRANSITION 4
#define MP3D_FLAGS_MASK 7
#else
#define MP3D_FLAGS_MASK 3
#endif
/* compile-time config */
#define MINIMP3_PREDECODE_FRAMES 2 /* frames to pre-decode and skip after seek (to fill internal structures) */
/*#define MINIMP3_SEEK_IDX_LINEAR_SEARCH*/ /* define to use linear index search instead of binary search on seek */
#define MINIMP3_IO_SIZE (128*1024) /* io buffer size for streaming functions, must be greater than MINIMP3_BUF_SIZE */
#define MINIMP3_BUF_SIZE (16*1024) /* buffer which can hold minimum 10 consecutive mp3 frames (~16KB) worst case */
/*#define MINIMP3_SCAN_LIMIT (256*1024)*/ /* how many bytes will be scanned to search first valid mp3 frame, to prevent stall on large non-mp3 files */
#define MINIMP3_ENABLE_RING 0 /* WIP enable hardware magic ring buffer if available, to make less input buffer memmove(s) in callback IO mode */
/* return error codes */
#define MP3D_E_PARAM -1
#define MP3D_E_MEMORY -2
#define MP3D_E_IOERROR -3
#define MP3D_E_USER -4 /* can be used to stop processing from callbacks without indicating specific error */
#define MP3D_E_DECODE -5 /* decode error which can't be safely skipped, such as sample rate, layer and channels change */
typedef struct
{
mp3d_sample_t *buffer;
size_t samples; /* channels included, byte size = samples*sizeof(mp3d_sample_t) */
int channels, hz, layer, avg_bitrate_kbps;
} mp3dec_file_info_t;
typedef struct
{
const uint8_t *buffer;
size_t size;
} mp3dec_map_info_t;
typedef struct
{
uint64_t sample;
uint64_t offset;
} mp3dec_frame_t;
typedef struct
{
mp3dec_frame_t *frames;
size_t num_frames, capacity;
} mp3dec_index_t;
typedef size_t (*MP3D_READ_CB)(void *buf, size_t size, void *user_data);
typedef int (*MP3D_SEEK_CB)(uint64_t position, void *user_data);
typedef struct
{
MP3D_READ_CB read;
void *read_data;
MP3D_SEEK_CB seek;
void *seek_data;
} mp3dec_io_t;
typedef struct
{
mp3dec_t mp3d;
mp3dec_map_info_t file;
mp3dec_io_t *io;
mp3dec_index_t index;
uint64_t offset, samples, detected_samples, cur_sample, start_offset, end_offset;
mp3dec_frame_info_t info;
mp3d_sample_t buffer[MINIMP3_MAX_SAMPLES_PER_FRAME];
size_t input_consumed, input_filled;
int is_file, flags, vbr_tag_found, indexes_built;
int free_format_bytes;
int buffer_samples, buffer_consumed, to_skip, start_delay;
int last_error;
} mp3dec_ex_t;
typedef int (*MP3D_ITERATE_CB)(void *user_data, const uint8_t *frame, int frame_size, int free_format_bytes, size_t buf_size, uint64_t offset, mp3dec_frame_info_t *info);
typedef int (*MP3D_PROGRESS_CB)(void *user_data, size_t file_size, uint64_t offset, mp3dec_frame_info_t *info);
#ifdef __cplusplus
extern "C" {
#endif
/* detect mp3/mpa format */
int mp3dec_detect_buf(const uint8_t *buf, size_t buf_size);
int mp3dec_detect_cb(mp3dec_io_t *io, uint8_t *buf, size_t buf_size);
/* decode whole buffer block */
int mp3dec_load_buf(mp3dec_t *dec, const uint8_t *buf, size_t buf_size, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data);
int mp3dec_load_cb(mp3dec_t *dec, mp3dec_io_t *io, uint8_t *buf, size_t buf_size, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data);
/* iterate through frames */
int mp3dec_iterate_buf(const uint8_t *buf, size_t buf_size, MP3D_ITERATE_CB callback, void *user_data);
int mp3dec_iterate_cb(mp3dec_io_t *io, uint8_t *buf, size_t buf_size, MP3D_ITERATE_CB callback, void *user_data);
/* streaming decoder with seeking capability */
int mp3dec_ex_open_buf(mp3dec_ex_t *dec, const uint8_t *buf, size_t buf_size, int flags);
int mp3dec_ex_open_cb(mp3dec_ex_t *dec, mp3dec_io_t *io, int flags);
void mp3dec_ex_close(mp3dec_ex_t *dec);
int mp3dec_ex_seek(mp3dec_ex_t *dec, uint64_t position);
size_t mp3dec_ex_read_frame(mp3dec_ex_t *dec, mp3d_sample_t **buf, mp3dec_frame_info_t *frame_info, size_t max_samples);
size_t mp3dec_ex_read(mp3dec_ex_t *dec, mp3d_sample_t *buf, size_t samples);
#ifndef MINIMP3_NO_STDIO
/* stdio versions of file detect, load, iterate and stream */
int mp3dec_detect(const char *file_name);
int mp3dec_load(mp3dec_t *dec, const char *file_name, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data);
int mp3dec_iterate(const char *file_name, MP3D_ITERATE_CB callback, void *user_data);
int mp3dec_ex_open(mp3dec_ex_t *dec, const char *file_name, int flags);
#ifdef _WIN32
int mp3dec_detect_w(const wchar_t *file_name);
int mp3dec_load_w(mp3dec_t *dec, const wchar_t *file_name, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data);
int mp3dec_iterate_w(const wchar_t *file_name, MP3D_ITERATE_CB callback, void *user_data);
int mp3dec_ex_open_w(mp3dec_ex_t *dec, const wchar_t *file_name, int flags);
#endif
#endif
#ifdef __cplusplus
}
#endif
#endif /*MINIMP3_EXT_H*/
#if defined(MINIMP3_IMPLEMENTATION) && !defined(_MINIMP3_EX_IMPLEMENTATION_GUARD)
#define _MINIMP3_EX_IMPLEMENTATION_GUARD
#include <limits.h>
#include "minimp3.h"
static void mp3dec_skip_id3v1(const uint8_t *buf, size_t *pbuf_size)
{
size_t buf_size = *pbuf_size;
#ifndef MINIMP3_NOSKIP_ID3V1
if (buf_size >= 128 && !memcmp(buf + buf_size - 128, "TAG", 3))
{
buf_size -= 128;
if (buf_size >= 227 && !memcmp(buf + buf_size - 227, "TAG+", 4))
buf_size -= 227;
}
#endif
#ifndef MINIMP3_NOSKIP_APEV2
if (buf_size > 32 && !memcmp(buf + buf_size - 32, "APETAGEX", 8))
{
buf_size -= 32;
const uint8_t *tag = buf + buf_size + 8 + 4;
uint32_t tag_size = (uint32_t)(tag[3] << 24) | (tag[2] << 16) | (tag[1] << 8) | tag[0];
if (buf_size >= tag_size)
buf_size -= tag_size;
}
#endif
*pbuf_size = buf_size;
}
static size_t mp3dec_skip_id3v2(const uint8_t *buf, size_t buf_size)
{
#define MINIMP3_ID3_DETECT_SIZE 10
#ifndef MINIMP3_NOSKIP_ID3V2
if (buf_size >= MINIMP3_ID3_DETECT_SIZE && !memcmp(buf, "ID3", 3) && !((buf[5] & 15) || (buf[6] & 0x80) || (buf[7] & 0x80) || (buf[8] & 0x80) || (buf[9] & 0x80)))
{
size_t id3v2size = (((buf[6] & 0x7f) << 21) | ((buf[7] & 0x7f) << 14) | ((buf[8] & 0x7f) << 7) | (buf[9] & 0x7f)) + 10;
if ((buf[5] & 16))
id3v2size += 10; /* footer */
return id3v2size;
}
#endif
return 0;
}
static void mp3dec_skip_id3(const uint8_t **pbuf, size_t *pbuf_size)
{
uint8_t *buf = (uint8_t *)(*pbuf);
size_t buf_size = *pbuf_size;
size_t id3v2size = mp3dec_skip_id3v2(buf, buf_size);
if (id3v2size)
{
if (id3v2size >= buf_size)
id3v2size = buf_size;
buf += id3v2size;
buf_size -= id3v2size;
}
mp3dec_skip_id3v1(buf, &buf_size);
*pbuf = (const uint8_t *)buf;
*pbuf_size = buf_size;
}
static int mp3dec_check_vbrtag(const uint8_t *frame, int frame_size, uint32_t *frames, int *delay, int *padding)
{
static const char g_xing_tag[4] = { 'X', 'i', 'n', 'g' };
static const char g_info_tag[4] = { 'I', 'n', 'f', 'o' };
#define FRAMES_FLAG 1
#define BYTES_FLAG 2
#define TOC_FLAG 4
#define VBR_SCALE_FLAG 8
/* Side info offsets after header:
/ Mono Stereo
/ MPEG1 17 32
/ MPEG2 & 2.5 9 17*/
bs_t bs[1];
L3_gr_info_t gr_info[4];
bs_init(bs, frame + HDR_SIZE, frame_size - HDR_SIZE);
if (HDR_IS_CRC(frame))
get_bits(bs, 16);
if (L3_read_side_info(bs, gr_info, frame) < 0)
return 0; /* side info corrupted */
const uint8_t *tag = frame + HDR_SIZE + bs->pos/8;
if (memcmp(g_xing_tag, tag, 4) && memcmp(g_info_tag, tag, 4))
return 0;
int flags = tag[7];
if (!((flags & FRAMES_FLAG)))
return -1;
tag += 8;
*frames = (uint32_t)(tag[0] << 24) | (tag[1] << 16) | (tag[2] << 8) | tag[3];
tag += 4;
if (flags & BYTES_FLAG)
tag += 4;
if (flags & TOC_FLAG)
tag += 100;
if (flags & VBR_SCALE_FLAG)
tag += 4;
*delay = *padding = 0;
if (*tag)
{ /* extension, LAME, Lavc, etc. Should be the same structure. */
tag += 21;
if (tag - frame + 14 >= frame_size)
return 0;
*delay = ((tag[0] << 4) | (tag[1] >> 4)) + (528 + 1);
*padding = (((tag[1] & 0xF) << 8) | tag[2]) - (528 + 1);
}
return 1;
}
int mp3dec_detect_buf(const uint8_t *buf, size_t buf_size)
{
return mp3dec_detect_cb(0, (uint8_t *)buf, buf_size);
}
int mp3dec_detect_cb(mp3dec_io_t *io, uint8_t *buf, size_t buf_size)
{
if (!buf || (size_t)-1 == buf_size || (io && buf_size < MINIMP3_BUF_SIZE))
return MP3D_E_PARAM;
size_t filled = buf_size;
if (io)
{
if (io->seek(0, io->seek_data))
return MP3D_E_IOERROR;
filled = io->read(buf, MINIMP3_ID3_DETECT_SIZE, io->read_data);
if (filled > MINIMP3_ID3_DETECT_SIZE)
return MP3D_E_IOERROR;
}
if (filled < MINIMP3_ID3_DETECT_SIZE)
return MP3D_E_USER; /* too small, can't be mp3/mpa */
if (mp3dec_skip_id3v2(buf, filled))
return 0; /* id3v2 tag is enough evidence */
if (io)
{
size_t readed = io->read(buf + MINIMP3_ID3_DETECT_SIZE, buf_size - MINIMP3_ID3_DETECT_SIZE, io->read_data);
if (readed > (buf_size - MINIMP3_ID3_DETECT_SIZE))
return MP3D_E_IOERROR;
filled += readed;
if (filled < MINIMP3_BUF_SIZE)
mp3dec_skip_id3v1(buf, &filled);
} else
{
mp3dec_skip_id3v1(buf, &filled);
if (filled > MINIMP3_BUF_SIZE)
filled = MINIMP3_BUF_SIZE;
}
int free_format_bytes, frame_size;
mp3d_find_frame(buf, filled, &free_format_bytes, &frame_size);
if (frame_size)
return 0; /* MAX_FRAME_SYNC_MATCHES consecutive frames found */
return MP3D_E_USER;
}
int mp3dec_load_buf(mp3dec_t *dec, const uint8_t *buf, size_t buf_size, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data)
{
return mp3dec_load_cb(dec, 0, (uint8_t *)buf, buf_size, info, progress_cb, user_data);
}
int mp3dec_load_cb(mp3dec_t *dec, mp3dec_io_t *io, uint8_t *buf, size_t buf_size, mp3dec_file_info_t *info, MP3D_PROGRESS_CB progress_cb, void *user_data)
{
if (!dec || !buf || !info || (size_t)-1 == buf_size || (io && buf_size < MINIMP3_BUF_SIZE))
return MP3D_E_PARAM;
uint64_t detected_samples = 0;
size_t orig_buf_size = buf_size;
int to_skip = 0;
mp3dec_frame_info_t frame_info;
memset(info, 0, sizeof(*info));
memset(&frame_info, 0, sizeof(frame_info));
/* skip id3 */
size_t filled = 0, consumed = 0;
int eof = 0, ret = 0;
if (io)
{
if (io->seek(0, io->seek_data))
return MP3D_E_IOERROR;
filled = io->read(buf, MINIMP3_ID3_DETECT_SIZE, io->read_data);
if (filled > MINIMP3_ID3_DETECT_SIZE)
return MP3D_E_IOERROR;
if (MINIMP3_ID3_DETECT_SIZE != filled)
return 0;
size_t id3v2size = mp3dec_skip_id3v2(buf, filled);
if (id3v2size)
{
if (io->seek(id3v2size, io->seek_data))
return MP3D_E_IOERROR;
filled = io->read(buf, buf_size, io->read_data);
if (filled > buf_size)
return MP3D_E_IOERROR;
} else
{
size_t readed = io->read(buf + MINIMP3_ID3_DETECT_SIZE, buf_size - MINIMP3_ID3_DETECT_SIZE, io->read_data);
if (readed > (buf_size - MINIMP3_ID3_DETECT_SIZE))
return MP3D_E_IOERROR;
filled += readed;
}
if (filled < MINIMP3_BUF_SIZE)
mp3dec_skip_id3v1(buf, &filled);
} else
{
mp3dec_skip_id3((const uint8_t **)&buf, &buf_size);
if (!buf_size)
return 0;
}
/* try to make allocation size assumption by first frame or vbr tag */
mp3dec_init(dec);
int samples;
do
{
uint32_t frames;
int i, delay, padding, free_format_bytes = 0, frame_size = 0;
const uint8_t *hdr;
if (io)
{
if (!eof && filled - consumed < MINIMP3_BUF_SIZE)
{ /* keep minimum 10 consecutive mp3 frames (~16KB) worst case */
memmove(buf, buf + consumed, filled - consumed);
filled -= consumed;
consumed = 0;
size_t readed = io->read(buf + filled, buf_size - filled, io->read_data);
if (readed > (buf_size - filled))
return MP3D_E_IOERROR;
if (readed != (buf_size - filled))
eof = 1;
filled += readed;
if (eof)
mp3dec_skip_id3v1(buf, &filled);
}
i = mp3d_find_frame(buf + consumed, filled - consumed, &free_format_bytes, &frame_size);
consumed += i;
hdr = buf + consumed;
} else
{
i = mp3d_find_frame(buf, buf_size, &free_format_bytes, &frame_size);
buf += i;
buf_size -= i;
hdr = buf;
}
if (i && !frame_size)
continue;
if (!frame_size)
return 0;
frame_info.channels = HDR_IS_MONO(hdr) ? 1 : 2;
frame_info.hz = hdr_sample_rate_hz(hdr);
frame_info.layer = 4 - HDR_GET_LAYER(hdr);
frame_info.bitrate_kbps = hdr_bitrate_kbps(hdr);
frame_info.frame_bytes = frame_size;
samples = hdr_frame_samples(hdr)*frame_info.channels;
if (3 != frame_info.layer)
break;
int ret = mp3dec_check_vbrtag(hdr, frame_size, &frames, &delay, &padding);
if (ret > 0)
{
padding *= frame_info.channels;
to_skip = delay*frame_info.channels;
detected_samples = samples*(uint64_t)frames;
if (detected_samples >= (uint64_t)to_skip)
detected_samples -= to_skip;
if (padding > 0 && detected_samples >= (uint64_t)padding)
detected_samples -= padding;
if (!detected_samples)
return 0;
}
if (ret)
{
if (io)
{
consumed += frame_size;
} else
{
buf += frame_size;
buf_size -= frame_size;
}
}
break;
} while(1);
size_t allocated = MINIMP3_MAX_SAMPLES_PER_FRAME*sizeof(mp3d_sample_t);
if (detected_samples)
allocated += detected_samples*sizeof(mp3d_sample_t);
else
allocated += (buf_size/frame_info.frame_bytes)*samples*sizeof(mp3d_sample_t);
info->buffer = (mp3d_sample_t*)malloc(allocated);
if (!info->buffer)
return MP3D_E_MEMORY;
/* save info */
info->channels = frame_info.channels;
info->hz = frame_info.hz;
info->layer = frame_info.layer;
/* decode all frames */
size_t avg_bitrate_kbps = 0, frames = 0;
do
{
if ((allocated - info->samples*sizeof(mp3d_sample_t)) < MINIMP3_MAX_SAMPLES_PER_FRAME*sizeof(mp3d_sample_t))
{
allocated *= 2;
mp3d_sample_t *alloc_buf = (mp3d_sample_t*)realloc(info->buffer, allocated);
if (!alloc_buf)
return MP3D_E_MEMORY;
info->buffer = alloc_buf;
}
if (io)
{
if (!eof && filled - consumed < MINIMP3_BUF_SIZE)
{ /* keep minimum 10 consecutive mp3 frames (~16KB) worst case */
memmove(buf, buf + consumed, filled - consumed);
filled -= consumed;
consumed = 0;
size_t readed = io->read(buf + filled, buf_size - filled, io->read_data);
if (readed != (buf_size - filled))
eof = 1;
filled += readed;
if (eof)
mp3dec_skip_id3v1(buf, &filled);
}
samples = mp3dec_decode_frame(dec, buf + consumed, filled - consumed, info->buffer + info->samples, &frame_info);
consumed += frame_info.frame_bytes;
} else
{
samples = mp3dec_decode_frame(dec, buf, MINIMP3_MIN(buf_size, (size_t)INT_MAX), info->buffer + info->samples, &frame_info);
buf += frame_info.frame_bytes;
buf_size -= frame_info.frame_bytes;
}
if (samples)
{
if (info->hz != frame_info.hz || info->layer != frame_info.layer)
{
ret = MP3D_E_DECODE;
break;
}
if (info->channels && info->channels != frame_info.channels)
{
#ifdef MINIMP3_ALLOW_MONO_STEREO_TRANSITION
info->channels = 0; /* mark file with mono-stereo transition */
#else
ret = MP3D_E_DECODE;
break;
#endif
}
samples *= frame_info.channels;
if (to_skip)
{
size_t skip = MINIMP3_MIN(samples, to_skip);
to_skip -= skip;
samples -= skip;
memmove(info->buffer, info->buffer + skip, samples*sizeof(mp3d_sample_t));
}
info->samples += samples;
avg_bitrate_kbps += frame_info.bitrate_kbps;
frames++;
if (progress_cb)
{
ret = progress_cb(user_data, orig_buf_size, orig_buf_size - buf_size, &frame_info);
if (ret)
break;
}
}
} while (frame_info.frame_bytes);
if (detected_samples && info->samples > detected_samples)
info->samples = detected_samples; /* cut padding */
/* reallocate to normal buffer size */
if (allocated != info->samples*sizeof(mp3d_sample_t))
{
mp3d_sample_t *alloc_buf = (mp3d_sample_t*)realloc(info->buffer, info->samples*sizeof(mp3d_sample_t));
if (!alloc_buf && info->samples)
return MP3D_E_MEMORY;
info->buffer = alloc_buf;
}
if (frames)
info->avg_bitrate_kbps = avg_bitrate_kbps/frames;
return ret;
}
int mp3dec_iterate_buf(const uint8_t *buf, size_t buf_size, MP3D_ITERATE_CB callback, void *user_data)
{
const uint8_t *orig_buf = buf;
if (!buf || (size_t)-1 == buf_size || !callback)
return MP3D_E_PARAM;
/* skip id3 */
mp3dec_skip_id3(&buf, &buf_size);
if (!buf_size)
return 0;
mp3dec_frame_info_t frame_info;
memset(&frame_info, 0, sizeof(frame_info));
do
{
int free_format_bytes = 0, frame_size = 0, ret;
int i = mp3d_find_frame(buf, buf_size, &free_format_bytes, &frame_size);
buf += i;
buf_size -= i;
if (i && !frame_size)
continue;
if (!frame_size)
break;
const uint8_t *hdr = buf;
frame_info.channels = HDR_IS_MONO(hdr) ? 1 : 2;
frame_info.hz = hdr_sample_rate_hz(hdr);
frame_info.layer = 4 - HDR_GET_LAYER(hdr);
frame_info.bitrate_kbps = hdr_bitrate_kbps(hdr);
frame_info.frame_bytes = frame_size;
if (callback)
{
if ((ret = callback(user_data, hdr, frame_size, free_format_bytes, buf_size, hdr - orig_buf, &frame_info)))
return ret;
}
buf += frame_size;
buf_size -= frame_size;
} while (1);
return 0;
}
int mp3dec_iterate_cb(mp3dec_io_t *io, uint8_t *buf, size_t buf_size, MP3D_ITERATE_CB callback, void *user_data)
{
if (!io || !buf || (size_t)-1 == buf_size || buf_size < MINIMP3_BUF_SIZE || !callback)
return MP3D_E_PARAM;
size_t filled = io->read(buf, MINIMP3_ID3_DETECT_SIZE, io->read_data), consumed = 0;
uint64_t readed = 0;
mp3dec_frame_info_t frame_info;
int eof = 0;
memset(&frame_info, 0, sizeof(frame_info));
if (filled > MINIMP3_ID3_DETECT_SIZE)
return MP3D_E_IOERROR;
if (MINIMP3_ID3_DETECT_SIZE != filled)
return 0;
size_t id3v2size = mp3dec_skip_id3v2(buf, filled);
if (id3v2size)
{
if (io->seek(id3v2size, io->seek_data))
return MP3D_E_IOERROR;
filled = io->read(buf, buf_size, io->read_data);
if (filled > buf_size)
return MP3D_E_IOERROR;
readed += id3v2size;
} else
{
size_t readed = io->read(buf + MINIMP3_ID3_DETECT_SIZE, buf_size - MINIMP3_ID3_DETECT_SIZE, io->read_data);
if (readed > (buf_size - MINIMP3_ID3_DETECT_SIZE))
return MP3D_E_IOERROR;
filled += readed;
}
if (filled < MINIMP3_BUF_SIZE)
mp3dec_skip_id3v1(buf, &filled);
do
{
int free_format_bytes = 0, frame_size = 0, ret;
int i = mp3d_find_frame(buf + consumed, filled - consumed, &free_format_bytes, &frame_size);
if (i && !frame_size)
{
consumed += i;
continue;
}
if (!frame_size)
break;
const uint8_t *hdr = buf + consumed + i;
frame_info.channels = HDR_IS_MONO(hdr) ? 1 : 2;
frame_info.hz = hdr_sample_rate_hz(hdr);
frame_info.layer = 4 - HDR_GET_LAYER(hdr);
frame_info.bitrate_kbps = hdr_bitrate_kbps(hdr);
frame_info.frame_bytes = frame_size;
readed += i;
if (callback)
{
if ((ret = callback(user_data, hdr, frame_size, free_format_bytes, filled - consumed, readed, &frame_info)))
return ret;
}
readed += frame_size;
consumed += i + frame_size;
if (!eof && filled - consumed < MINIMP3_BUF_SIZE)
{ /* keep minimum 10 consecutive mp3 frames (~16KB) worst case */
memmove(buf, buf + consumed, filled - consumed);
filled -= consumed;
consumed = 0;
size_t readed = io->read(buf + filled, buf_size - filled, io->read_data);
if (readed > (buf_size - filled))
return MP3D_E_IOERROR;
if (readed != (buf_size - filled))
eof = 1;
filled += readed;
if (eof)
mp3dec_skip_id3v1(buf, &filled);
}
} while (1);
return 0;
}
static int mp3dec_load_index(void *user_data, const uint8_t *frame, int frame_size, int free_format_bytes, size_t buf_size, uint64_t offset, mp3dec_frame_info_t *info)
{
mp3dec_frame_t *idx_frame;
mp3dec_ex_t *dec = (mp3dec_ex_t *)user_data;
if (!dec->index.frames && !dec->start_offset)
{ /* detect VBR tag and try to avoid full scan */
uint32_t frames;
int delay, padding;
dec->info = *info;
dec->start_offset = dec->offset = offset;
dec->end_offset = offset + buf_size;
dec->free_format_bytes = free_format_bytes; /* should not change */
if (3 == dec->info.layer)
{
int ret = mp3dec_check_vbrtag(frame, frame_size, &frames, &delay, &padding);
if (ret)
dec->start_offset = dec->offset = offset + frame_size;
if (ret > 0)
{
padding *= info->channels;
dec->start_delay = dec->to_skip = delay*info->channels;
dec->samples = hdr_frame_samples(frame)*info->channels*(uint64_t)frames;
if (dec->samples >= (uint64_t)dec->start_delay)
dec->samples -= dec->start_delay;
if (padding > 0 && dec->samples >= (uint64_t)padding)
dec->samples -= padding;
dec->detected_samples = dec->samples;
dec->vbr_tag_found = 1;
return MP3D_E_USER;
} else if (ret < 0)
return 0;
}
}
if (dec->flags & MP3D_DO_NOT_SCAN)
return MP3D_E_USER;
if (dec->index.num_frames + 1 > dec->index.capacity)
{
if (!dec->index.capacity)
dec->index.capacity = 4096;
else
dec->index.capacity *= 2;
mp3dec_frame_t *alloc_buf = (mp3dec_frame_t *)realloc((void*)dec->index.frames, sizeof(mp3dec_frame_t)*dec->index.capacity);
if (!alloc_buf)
return MP3D_E_MEMORY;
dec->index.frames = alloc_buf;
}
idx_frame = &dec->index.frames[dec->index.num_frames++];
idx_frame->offset = offset;
idx_frame->sample = dec->samples;
if (!dec->buffer_samples && dec->index.num_frames < 256)
{ /* for some cutted mp3 frames, bit-reservoir not filled and decoding can't be started from first frames */
/* try to decode up to 255 first frames till samples starts to decode */
dec->buffer_samples = mp3dec_decode_frame(&dec->mp3d, frame, MINIMP3_MIN(buf_size, (size_t)INT_MAX), dec->buffer, info);
dec->samples += dec->buffer_samples*info->channels;
} else
dec->samples += hdr_frame_samples(frame)*info->channels;
return 0;
}
int mp3dec_ex_open_buf(mp3dec_ex_t *dec, const uint8_t *buf, size_t buf_size, int flags)
{
if (!dec || !buf || (size_t)-1 == buf_size || (flags & (~MP3D_FLAGS_MASK)))
return MP3D_E_PARAM;
memset(dec, 0, sizeof(*dec));
dec->file.buffer = buf;
dec->file.size = buf_size;
dec->flags = flags;
mp3dec_init(&dec->mp3d);
int ret = mp3dec_iterate_buf(dec->file.buffer, dec->file.size, mp3dec_load_index, dec);
if (ret && MP3D_E_USER != ret)
return ret;
mp3dec_init(&dec->mp3d);
dec->buffer_samples = 0;
dec->indexes_built = !(dec->vbr_tag_found || (flags & MP3D_DO_NOT_SCAN));
dec->flags &= (~MP3D_DO_NOT_SCAN);
return 0;
}
#ifndef MINIMP3_SEEK_IDX_LINEAR_SEARCH
static size_t mp3dec_idx_binary_search(mp3dec_index_t *idx, uint64_t position)
{
size_t end = idx->num_frames, start = 0, index = 0;
while (start <= end)
{
size_t mid = (start + end) / 2;
if (idx->frames[mid].sample >= position)
{ /* move left side. */
if (idx->frames[mid].sample == position)
return mid;
end = mid - 1;
} else
{ /* move to right side */
index = mid;
start = mid + 1;
if (start == idx->num_frames)
break;
}
}
return index;
}
#endif
int mp3dec_ex_seek(mp3dec_ex_t *dec, uint64_t position)
{
size_t i;
if (!dec)
return MP3D_E_PARAM;
if (!(dec->flags & MP3D_SEEK_TO_SAMPLE))
{
if (dec->io)
{
dec->offset = position;
} else
{
dec->offset = MINIMP3_MIN(position, dec->file.size);
}
dec->cur_sample = 0;
goto do_exit;
}
dec->cur_sample = position;
position += dec->start_delay;
if (0 == position)
{ /* optimize seek to zero, no index needed */
seek_zero:
dec->offset = dec->start_offset;
dec->to_skip = 0;
goto do_exit;
}
if (!dec->indexes_built)
{ /* no index created yet (vbr tag used to calculate track length or MP3D_DO_NOT_SCAN open flag used) */
dec->indexes_built = 1;
dec->samples = 0;
dec->buffer_samples = 0;
if (dec->io)
{
if (dec->io->seek(dec->start_offset, dec->io->seek_data))
return MP3D_E_IOERROR;
int ret = mp3dec_iterate_cb(dec->io, (uint8_t *)dec->file.buffer, dec->file.size, mp3dec_load_index, dec);
if (ret && MP3D_E_USER != ret)
return ret;
} else
{
int ret = mp3dec_iterate_buf(dec->file.buffer + dec->start_offset, dec->file.size - dec->start_offset, mp3dec_load_index, dec);
if (ret && MP3D_E_USER != ret)
return ret;
}
for (i = 0; i < dec->index.num_frames; i++)
dec->index.frames[i].offset += dec->start_offset;
dec->samples = dec->detected_samples;
}
if (!dec->index.frames)
goto seek_zero; /* no frames in file - seek to zero */
#ifdef MINIMP3_SEEK_IDX_LINEAR_SEARCH
for (i = 0; i < dec->index.num_frames; i++)
{
if (dec->index.frames[i].sample >= position)
break;
}
#else
i = mp3dec_idx_binary_search(&dec->index, position);
#endif
if (i)
{
int to_fill_bytes = 511;
int skip_frames = MINIMP3_PREDECODE_FRAMES
#ifdef MINIMP3_SEEK_IDX_LINEAR_SEARCH
+ ((dec->index.frames[i].sample == position) ? 0 : 1)
#endif
;
i -= MINIMP3_MIN(i, (size_t)skip_frames);
if (3 == dec->info.layer)
{
while (i && to_fill_bytes)
{ /* make sure bit-reservoir is filled when we start decoding */
bs_t bs[1];
L3_gr_info_t gr_info[4];
int frame_bytes, frame_size;
const uint8_t *hdr;
if (dec->io)
{
hdr = dec->file.buffer;
if (dec->io->seek(dec->index.frames[i - 1].offset, dec->io->seek_data))
return MP3D_E_IOERROR;
size_t readed = dec->io->read((uint8_t *)hdr, HDR_SIZE, dec->io->read_data);
if (readed != HDR_SIZE)
return MP3D_E_IOERROR;
frame_size = hdr_frame_bytes(hdr, dec->free_format_bytes) + hdr_padding(hdr);
readed = dec->io->read((uint8_t *)hdr + HDR_SIZE, frame_size - HDR_SIZE, dec->io->read_data);
if (readed != (size_t)(frame_size - HDR_SIZE))
return MP3D_E_IOERROR;
bs_init(bs, hdr + HDR_SIZE, frame_size - HDR_SIZE);
} else
{
hdr = dec->file.buffer + dec->index.frames[i - 1].offset;
frame_size = hdr_frame_bytes(hdr, dec->free_format_bytes) + hdr_padding(hdr);
bs_init(bs, hdr + HDR_SIZE, frame_size - HDR_SIZE);
}
if (HDR_IS_CRC(hdr))
get_bits(bs, 16);
i--;
if (L3_read_side_info(bs, gr_info, hdr) < 0)
break; /* frame not decodable, we can start from here */
frame_bytes = (bs->limit - bs->pos)/8;
to_fill_bytes -= MINIMP3_MIN(to_fill_bytes, frame_bytes);
}
}
}
dec->offset = dec->index.frames[i].offset;
dec->to_skip = position - dec->index.frames[i].sample;
while ((i + 1) < dec->index.num_frames && !dec->index.frames[i].sample && !dec->index.frames[i + 1].sample)
{ /* skip not decodable first frames */
const uint8_t *hdr;
if (dec->io)
{
hdr = dec->file.buffer;
if (dec->io->seek(dec->index.frames[i].offset, dec->io->seek_data))
return MP3D_E_IOERROR;
size_t readed = dec->io->read((uint8_t *)hdr, HDR_SIZE, dec->io->read_data);
if (readed != HDR_SIZE)
return MP3D_E_IOERROR;
} else
hdr = dec->file.buffer + dec->index.frames[i].offset;
dec->to_skip += hdr_frame_samples(hdr)*dec->info.channels;
i++;
}
do_exit:
if (dec->io)
{
if (dec->io->seek(dec->offset, dec->io->seek_data))
return MP3D_E_IOERROR;
}
dec->buffer_samples = 0;
dec->buffer_consumed = 0;
dec->input_consumed = 0;
dec->input_filled = 0;
dec->last_error = 0;
mp3dec_init(&dec->mp3d);
return 0;
}
size_t mp3dec_ex_read_frame(mp3dec_ex_t *dec, mp3d_sample_t **buf, mp3dec_frame_info_t *frame_info, size_t max_samples)
{
if (!dec || !buf || !frame_info)
{
if (dec)
dec->last_error = MP3D_E_PARAM;
return 0;
}
if (dec->detected_samples && dec->cur_sample >= dec->detected_samples)
return 0; /* at end of stream */
if (dec->last_error)
return 0; /* error eof state, seek can reset it */
*buf = NULL;
uint64_t end_offset = dec->end_offset ? dec->end_offset : dec->file.size;
int eof = 0;
while (dec->buffer_consumed == dec->buffer_samples)
{
const uint8_t *dec_buf;
if (dec->io)
{
if (!eof && (dec->input_filled - dec->input_consumed) < MINIMP3_BUF_SIZE)
{ /* keep minimum 10 consecutive mp3 frames (~16KB) worst case */
memmove((uint8_t*)dec->file.buffer, (uint8_t*)dec->file.buffer + dec->input_consumed, dec->input_filled - dec->input_consumed);
dec->input_filled -= dec->input_consumed;
dec->input_consumed = 0;
size_t readed = dec->io->read((uint8_t*)dec->file.buffer + dec->input_filled, dec->file.size - dec->input_filled, dec->io->read_data);
if (readed > (dec->file.size - dec->input_filled))
{
dec->last_error = MP3D_E_IOERROR;
readed = 0;
}
if (readed != (dec->file.size - dec->input_filled))
eof = 1;
dec->input_filled += readed;
if (eof)
mp3dec_skip_id3v1((uint8_t*)dec->file.buffer, &dec->input_filled);
}
dec_buf = dec->file.buffer + dec->input_consumed;
if (!(dec->input_filled - dec->input_consumed))
return 0;
dec->buffer_samples = mp3dec_decode_frame(&dec->mp3d, dec_buf, dec->input_filled - dec->input_consumed, dec->buffer, frame_info);
dec->input_consumed += frame_info->frame_bytes;
} else
{
dec_buf = dec->file.buffer + dec->offset;
uint64_t buf_size = end_offset - dec->offset;
if (!buf_size)
return 0;
dec->buffer_samples = mp3dec_decode_frame(&dec->mp3d, dec_buf, MINIMP3_MIN(buf_size, (uint64_t)INT_MAX), dec->buffer, frame_info);
}
dec->buffer_consumed = 0;
if (dec->info.hz != frame_info->hz || dec->info.layer != frame_info->layer)
{
return_e_decode:
dec->last_error = MP3D_E_DECODE;
return 0;
}
if (dec->buffer_samples)
{
dec->buffer_samples *= frame_info->channels;
if (dec->to_skip)
{
size_t skip = MINIMP3_MIN(dec->buffer_samples, dec->to_skip);
dec->buffer_consumed += skip;
dec->to_skip -= skip;
}
if (
#ifdef MINIMP3_ALLOW_MONO_STEREO_TRANSITION
!(dec->flags & MP3D_ALLOW_MONO_STEREO_TRANSITION) &&
#endif
dec->buffer_consumed != dec->buffer_samples && dec->info.channels != frame_info->channels)
{
goto return_e_decode;
}
} else if (dec->to_skip)
{ /* In mp3 decoding not always can start decode from any frame because of bit reservoir,
count skip samples for such frames */
int frame_samples = hdr_frame_samples(dec_buf)*frame_info->channels;
dec->to_skip -= MINIMP3_MIN(frame_samples, dec->to_skip);
}
dec->offset += frame_info->frame_bytes;
}
size_t out_samples = MINIMP3_MIN((size_t)(dec->buffer_samples - dec->buffer_consumed), max_samples);
if (dec->detected_samples)
{ /* count decoded samples to properly cut padding */
if (dec->cur_sample + out_samples >= dec->detected_samples)
out_samples = dec->detected_samples - dec->cur_sample;
}
dec->cur_sample += out_samples;
*buf = dec->buffer + dec->buffer_consumed;
dec->buffer_consumed += out_samples;
return out_samples;
}
size_t mp3dec_ex_read(mp3dec_ex_t *dec, mp3d_sample_t *buf, size_t samples)
{
if (!dec || !buf)
{
if (dec)
dec->last_error = MP3D_E_PARAM;
return 0;
}
mp3dec_frame_info_t frame_info;
memset(&frame_info, 0, sizeof(frame_info));
size_t samples_requested = samples;
while (samples)
{
mp3d_sample_t *buf_frame = NULL;
size_t read_samples = mp3dec_ex_read_frame(dec, &buf_frame, &frame_info, samples);
if (!read_samples)
{
break;
}
memcpy(buf, buf_frame, read_samples * sizeof(mp3d_sample_t));
buf += read_samples;
samples -= read_samples;
}
return samples_requested - samples;
}
int mp3dec_ex_open_cb(mp3dec_ex_t *dec, mp3dec_io_t *io, int flags)
{
if (!dec || !io || (flags & (~MP3D_FLAGS_MASK)))
return MP3D_E_PARAM;
memset(dec, 0, sizeof(*dec));
#ifdef MINIMP3_HAVE_RING
int ret;
if (ret = mp3dec_open_ring(&dec->file, MINIMP3_IO_SIZE))
return ret;
#else
dec->file.size = MINIMP3_IO_SIZE;
dec->file.buffer = (const uint8_t*)malloc(dec->file.size);
if (!dec->file.buffer)
return MP3D_E_MEMORY;
#endif
dec->flags = flags;
dec->io = io;
mp3dec_init(&dec->mp3d);
if (io->seek(0, io->seek_data))
return MP3D_E_IOERROR;
int ret = mp3dec_iterate_cb(io, (uint8_t *)dec->file.buffer, dec->file.size, mp3dec_load_index, dec);
if (ret && MP3D_E_USER != ret)
return ret;
if (dec->io->seek(dec->start_offset, dec->io->seek_data))
return MP3D_E_IOERROR;