mirror of
https://github.com/mpv-player/mpv
synced 2024-12-09 08:29:42 +00:00
47c016bd18
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@14911 b3059339-0415-0410-9bf9-f77b7e298cf2
535 lines
16 KiB
C
535 lines
16 KiB
C
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#include "config.h"
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#include "../mp_msg.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include "stream.h"
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#include "demuxer.h"
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#include "stheader.h"
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#include "genres.h"
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#include "mp3_hdr.h"
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#include <string.h>
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#ifdef MP_DEBUG
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#include <assert.h>
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#endif
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#define MP3 1
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#define WAV 2
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#define fLaC 3
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#define HDR_SIZE 4
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typedef struct da_priv {
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int frmt;
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float last_pts;
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} da_priv_t;
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// how many valid frames in a row we need before accepting as valid MP3
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#define MIN_MP3_HDRS 5
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//! Used to describe a potential (chain of) MP3 headers we found
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typedef struct mp3_hdr {
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off_t frame_pos; // start of first frame in this "chain" of headers
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off_t next_frame_pos; // here we expect the next header with same parameters
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int mp3_chans;
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int mp3_freq;
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int cons_hdrs; // if this reaches MIN_MP3_HDRS we accept as MP3 file
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struct mp3_hdr *next;
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} mp3_hdr_t;
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extern void free_sh_audio(sh_audio_t* sh);
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extern void resync_audio_stream(sh_audio_t *sh_audio);
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extern void print_wave_header(WAVEFORMATEX *h);
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int hr_mp3_seek = 0;
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/**
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* \brief free a list of MP3 header descriptions
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* \param list pointer to the head-of-list pointer
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*/
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static void free_mp3_hdrs(mp3_hdr_t **list) {
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mp3_hdr_t *tmp;
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while (*list) {
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tmp = (*list)->next;
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free(*list);
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*list = tmp;
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}
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}
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/**
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* \brief add another potential MP3 header to our list
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* If it fits into an existing chain this one is expanded otherwise
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* a new one is created.
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* All entries that expected a MP3 header before the current position
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* are discarded.
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* The list is expected to be and will be kept sorted by next_frame_pos
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* and when those are equal by frame_pos.
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* \param list pointer to the head-of-list pointer
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* \param st_pos stream position where the described header starts
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* \param mp3_chans number of channels as specified by the header
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* \param mp3_freq sampling frequency as specified by the header
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* \param mp3_flen length of the frame as specified by the header
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* \return If non-null the current file is accepted as MP3 and the
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* mp3_hdr struct describing the valid chain is returned. Must be
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* freed independent of the list.
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*/
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static mp3_hdr_t *add_mp3_hdr(mp3_hdr_t **list, off_t st_pos,
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int mp3_chans, int mp3_freq, int mp3_flen) {
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mp3_hdr_t *tmp;
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int in_list = 0;
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while (*list && (*list)->next_frame_pos <= st_pos) {
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if (((*list)->next_frame_pos < st_pos) || ((*list)->mp3_chans != mp3_chans)
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|| ((*list)->mp3_freq != mp3_freq)) { // wasn't valid!
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tmp = (*list)->next;
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free(*list);
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*list = tmp;
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} else {
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(*list)->cons_hdrs++;
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(*list)->next_frame_pos = st_pos + mp3_flen;
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if ((*list)->cons_hdrs >= MIN_MP3_HDRS) {
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// copy the valid entry, so that the list can be easily freed
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tmp = malloc(sizeof(mp3_hdr_t));
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memcpy(tmp, *list, sizeof(mp3_hdr_t));
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tmp->next = NULL;
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return tmp;
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}
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in_list = 1;
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list = &((*list)->next);
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}
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}
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if (!in_list) { // does not belong into an existing chain, insert
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tmp = malloc(sizeof(mp3_hdr_t));
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tmp->frame_pos = st_pos;
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tmp->next_frame_pos = st_pos + mp3_flen;
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tmp->mp3_chans = mp3_chans;
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tmp->mp3_freq = mp3_freq;
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tmp->cons_hdrs = 1;
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tmp->next = *list;
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*list = tmp;
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}
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return NULL;
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}
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int demux_audio_open(demuxer_t* demuxer) {
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stream_t *s;
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sh_audio_t* sh_audio;
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uint8_t hdr[HDR_SIZE];
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int frmt = 0, n = 0, step, mp3_freq, mp3_chans, mp3_flen;
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off_t st_pos = 0, next_frame_pos = 0;
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// mp3_hdrs list is sorted first by next_frame_pos and then by frame_pos
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mp3_hdr_t *mp3_hdrs = NULL, *mp3_found = NULL;
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da_priv_t* priv;
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#ifdef MP_DEBUG
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assert(demuxer != NULL);
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assert(demuxer->stream != NULL);
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#endif
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s = demuxer->stream;
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stream_read(s, hdr, HDR_SIZE);
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while(n < 30000 && !s->eof) {
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st_pos = stream_tell(s) - HDR_SIZE;
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step = 1;
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if( hdr[0] == 'R' && hdr[1] == 'I' && hdr[2] == 'F' && hdr[3] == 'F' ) {
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stream_skip(s,4);
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if(s->eof)
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break;
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stream_read(s,hdr,4);
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if(s->eof)
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break;
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if(hdr[0] != 'W' || hdr[1] != 'A' || hdr[2] != 'V' || hdr[3] != 'E' )
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stream_skip(s,-8);
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else
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// We found wav header. Now we can have 'fmt ' or a mp3 header
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// empty the buffer
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step = 4;
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} else if( hdr[0] == 'I' && hdr[1] == 'D' && hdr[2] == '3' && (hdr[3] >= 2)) {
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int len;
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stream_skip(s,2);
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stream_read(s,hdr,4);
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len = (hdr[0]<<21) | (hdr[1]<<14) | (hdr[2]<<7) | hdr[3];
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stream_skip(s,len);
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step = 4;
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} else if( hdr[0] == 'f' && hdr[1] == 'm' && hdr[2] == 't' && hdr[3] == ' ' ) {
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frmt = WAV;
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break;
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} else if((mp3_flen = mp_get_mp3_header(hdr,&mp3_chans,&mp3_freq)) > 0) {
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mp3_found = add_mp3_hdr(&mp3_hdrs, st_pos, mp3_chans, mp3_freq, mp3_flen);
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if (mp3_found) {
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frmt = MP3;
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break;
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}
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} else if( hdr[0] == 'f' && hdr[1] == 'L' && hdr[2] == 'a' && hdr[3] == 'C' ) {
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frmt = fLaC;
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stream_skip(s,-4);
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break;
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}
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// Add here some other audio format detection
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if(step < HDR_SIZE)
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memmove(hdr,&hdr[step],HDR_SIZE-step);
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stream_read(s, &hdr[HDR_SIZE - step], step);
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n++;
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}
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free_mp3_hdrs(&mp3_hdrs);
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if(!frmt)
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return 0;
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sh_audio = new_sh_audio(demuxer,0);
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switch(frmt) {
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case MP3:
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sh_audio->format = 0x55;
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demuxer->movi_start = mp3_found->frame_pos;
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next_frame_pos = mp3_found->next_frame_pos;
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sh_audio->audio.dwSampleSize= 0;
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sh_audio->audio.dwScale = 1152;
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sh_audio->audio.dwRate = mp3_found->mp3_freq;
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sh_audio->wf = malloc(sizeof(WAVEFORMATEX));
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sh_audio->wf->wFormatTag = sh_audio->format;
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sh_audio->wf->nChannels = mp3_found->mp3_chans;
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sh_audio->wf->nSamplesPerSec = mp3_found->mp3_freq;
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sh_audio->wf->nBlockAlign = 1152;
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sh_audio->wf->wBitsPerSample = 16;
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sh_audio->wf->cbSize = 0;
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free(mp3_found);
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mp3_found = NULL;
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if(s->end_pos) {
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char tag[4];
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stream_seek(s,s->end_pos-128);
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stream_read(s,tag,3);
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tag[3] = '\0';
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if(strcmp(tag,"TAG"))
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demuxer->movi_end = s->end_pos;
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else {
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char buf[31];
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uint8_t g;
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demuxer->movi_end = stream_tell(s)-3;
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stream_read(s,buf,30);
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buf[30] = '\0';
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demux_info_add(demuxer,"Title",buf);
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stream_read(s,buf,30);
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buf[30] = '\0';
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demux_info_add(demuxer,"Artist",buf);
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stream_read(s,buf,30);
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buf[30] = '\0';
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demux_info_add(demuxer,"Album",buf);
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stream_read(s,buf,4);
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buf[4] = '\0';
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demux_info_add(demuxer,"Year",buf);
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stream_read(s,buf,30);
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buf[30] = '\0';
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demux_info_add(demuxer,"Comment",buf);
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if(buf[28] == 0 && buf[29] != 0) {
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uint8_t trk = (uint8_t)buf[29];
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sprintf(buf,"%d",trk);
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demux_info_add(demuxer,"Track",buf);
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}
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g = stream_read_char(s);
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demux_info_add(demuxer,"Genre",genres[g]);
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}
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}
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break;
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case WAV: {
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unsigned int chunk_type;
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unsigned int chunk_size;
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WAVEFORMATEX* w;
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int l;
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l = stream_read_dword_le(s);
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if(l < 16) {
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mp_msg(MSGT_DEMUX,MSGL_ERR,"[demux_audio] Bad wav header length: too short (%d)!!!\n",l);
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free_sh_audio(sh_audio);
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return 0;
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}
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sh_audio->wf = w = (WAVEFORMATEX*)malloc(l > sizeof(WAVEFORMATEX) ? l : sizeof(WAVEFORMATEX));
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w->wFormatTag = sh_audio->format = stream_read_word_le(s);
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w->nChannels = sh_audio->channels = stream_read_word_le(s);
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w->nSamplesPerSec = sh_audio->samplerate = stream_read_dword_le(s);
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w->nAvgBytesPerSec = stream_read_dword_le(s);
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w->nBlockAlign = stream_read_word_le(s);
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w->wBitsPerSample = sh_audio->samplesize = stream_read_word_le(s);
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w->cbSize = 0;
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l -= 16;
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if (l > 0) {
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w->cbSize = stream_read_word_le(s);
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l -= 2;
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if (w->cbSize > 0) {
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if (l < w->cbSize) {
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mp_msg(MSGT_DEMUX,MSGL_ERR,"[demux_audio] truncated extradata (%d < %d)\n",
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l,w->cbSize);
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stream_read(s,(char*)((char*)(w)+sizeof(WAVEFORMATEX)),l);
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l = 0;
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} else {
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stream_read(s,(char*)((char*)(w)+sizeof(WAVEFORMATEX)),w->cbSize);
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l -= w->cbSize;
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}
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}
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}
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if(verbose>0) print_wave_header(w);
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if(l)
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stream_skip(s,l);
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do
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{
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chunk_type = stream_read_fourcc(demuxer->stream);
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chunk_size = stream_read_dword_le(demuxer->stream);
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if (chunk_type != mmioFOURCC('d', 'a', 't', 'a'))
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stream_skip(demuxer->stream, chunk_size);
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} while (chunk_type != mmioFOURCC('d', 'a', 't', 'a'));
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demuxer->movi_start = stream_tell(s);
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demuxer->movi_end = s->end_pos;
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// printf("wav: %X .. %X\n",(int)demuxer->movi_start,(int)demuxer->movi_end);
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// Check if it contains dts audio
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if((w->wFormatTag == 0x01) && (w->nChannels == 2) && (w->nSamplesPerSec == 44100)) {
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unsigned char buf[16384]; // vlc uses 16384*4 (4 dts frames)
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unsigned int i;
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stream_read(s, buf, sizeof(buf));
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for (i = 0; i < sizeof(buf); i += 2) {
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// DTS, 14 bit, LE
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if((buf[i] == 0xff) && (buf[i+1] == 0x1f) && (buf[i+2] == 0x00) &&
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(buf[i+3] == 0xe8) && ((buf[i+4] & 0xfe) == 0xf0) && (buf[i+5] == 0x07)) {
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sh_audio->format = 0x2001;
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mp_msg(MSGT_DEMUX,MSGL_V,"[demux_audio] DTS audio in wav, 14 bit, LE\n");
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break;
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}
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// DTS, 14 bit, BE
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if((buf[i] == 0x1f) && (buf[i+1] == 0xff) && (buf[i+2] == 0xe8) &&
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(buf[i+3] == 0x00) && (buf[i+4] == 0x07) && ((buf[i+5] & 0xfe) == 0xf0)) {
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sh_audio->format = 0x2001;
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mp_msg(MSGT_DEMUX,MSGL_V,"[demux_audio] DTS audio in wav, 14 bit, BE\n");
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break;
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}
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// DTS, 16 bit, BE
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if((buf[i] == 0x7f) && (buf[i+1] == 0xfe) && (buf[i+2] == 0x80) &&
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(buf[i+3] == 0x01)) {
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sh_audio->format = 0x2001;
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mp_msg(MSGT_DEMUX,MSGL_V,"[demux_audio] DTS audio in wav, 16 bit, BE\n");
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break;
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}
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// DTS, 16 bit, LE
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if((buf[i] == 0xfe) && (buf[i+1] == 0x7f) && (buf[i+2] == 0x01) &&
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(buf[i+3] == 0x80)) {
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sh_audio->format = 0x2001;
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mp_msg(MSGT_DEMUX,MSGL_V,"[demux_audio] DTS audio in wav, 16 bit, LE\n");
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break;
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}
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}
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if (sh_audio->format == 0x2001)
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mp_msg(MSGT_DEMUX,MSGL_DBG2,"[demux_audio] DTS sync offset = %u\n", i);
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}
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stream_seek(s,demuxer->movi_start);
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} break;
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case fLaC:
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sh_audio->format = mmioFOURCC('f', 'L', 'a', 'C');
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demuxer->movi_start = stream_tell(s);
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demuxer->movi_end = s->end_pos;
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break;
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}
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priv = (da_priv_t*)malloc(sizeof(da_priv_t));
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priv->frmt = frmt;
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priv->last_pts = -1;
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demuxer->priv = priv;
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demuxer->audio->id = 0;
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demuxer->audio->sh = sh_audio;
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sh_audio->ds = demuxer->audio;
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sh_audio->samplerate = sh_audio->audio.dwRate;
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if(stream_tell(s) != demuxer->movi_start)
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{
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mp_msg(MSGT_DEMUX, MSGL_V, "demux_audio: seeking from 0x%X to start pos 0x%X\n",
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(int)stream_tell(s), (int)demuxer->movi_start);
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stream_seek(s,demuxer->movi_start);
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if (stream_tell(s) != demuxer->movi_start) {
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mp_msg(MSGT_DEMUX, MSGL_V, "demux_audio: seeking failed, now at 0x%X!\n",
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(int)stream_tell(s));
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if (next_frame_pos) {
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mp_msg(MSGT_DEMUX, MSGL_V, "demux_audio: seeking to 0x%X instead\n",
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(int)next_frame_pos);
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stream_seek(s, next_frame_pos);
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}
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}
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}
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mp_msg(MSGT_DEMUX,MSGL_V,"demux_audio: audio data 0x%X - 0x%X \n",(int)demuxer->movi_start,(int)demuxer->movi_end);
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return 1;
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}
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int demux_audio_fill_buffer(demux_stream_t *ds) {
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int l;
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demux_packet_t* dp;
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sh_audio_t* sh_audio;
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demuxer_t* demux;
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da_priv_t* priv;
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stream_t* s;
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#ifdef MP_DEBUG
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assert(ds != NULL);
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assert(ds->sh != NULL);
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assert(ds->demuxer != NULL);
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#endif
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sh_audio = ds->sh;
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demux = ds->demuxer;
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priv = demux->priv;
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s = demux->stream;
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if(s->eof || (demux->movi_end && stream_tell(s) >= demux->movi_end) )
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return 0;
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switch(priv->frmt) {
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case MP3 :
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while(1) {
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uint8_t hdr[4];
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stream_read(s,hdr,4);
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if (s->eof || (demux->movi_end && stream_tell(s) >= demux->movi_end))
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return 0;
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l = mp_decode_mp3_header(hdr);
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if(l < 0) {
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stream_skip(s,-3);
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} else {
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dp = new_demux_packet(l);
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memcpy(dp->buffer,hdr,4);
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stream_read(s,dp->buffer + 4,l-4);
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priv->last_pts = priv->last_pts < 0 ? 0 : priv->last_pts + 1152/(float)sh_audio->samplerate; // FIXME: 1152->576 if MPEG-2
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break;
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}
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} break;
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case WAV : {
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l = sh_audio->wf->nAvgBytesPerSec;
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dp = new_demux_packet(l);
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l = stream_read(s,dp->buffer,l);
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priv->last_pts = priv->last_pts < 0 ? 0 : priv->last_pts + l/(float)sh_audio->i_bps;
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break;
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}
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case fLaC: {
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l = 65535;
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dp = new_demux_packet(l);
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l = stream_read(s,dp->buffer,l);
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priv->last_pts = priv->last_pts < 0 ? 0 : priv->last_pts + l/(float)sh_audio->i_bps;
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break;
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}
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default:
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printf("Audio demuxer : unknown format %d\n",priv->frmt);
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return 0;
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}
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resize_demux_packet(dp, l);
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ds->pts = priv->last_pts - (ds_tell_pts(demux->audio) -
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sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
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ds_add_packet(ds, dp);
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return 1;
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}
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static void high_res_mp3_seek(demuxer_t *demuxer,float time) {
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uint8_t hdr[4];
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int len,nf;
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da_priv_t* priv = demuxer->priv;
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sh_audio_t* sh = (sh_audio_t*)demuxer->audio->sh;
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|
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nf = time*sh->samplerate/1152;
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while(nf > 0) {
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stream_read(demuxer->stream,hdr,4);
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len = mp_decode_mp3_header(hdr);
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if(len < 0) {
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stream_skip(demuxer->stream,-3);
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continue;
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}
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|
stream_skip(demuxer->stream,len-4);
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priv->last_pts += 1152/(float)sh->samplerate;
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|
nf--;
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}
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}
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|
|
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void demux_audio_seek(demuxer_t *demuxer,float rel_seek_secs,int flags){
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|
sh_audio_t* sh_audio;
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|
stream_t* s;
|
|
int base,pos;
|
|
float len;
|
|
da_priv_t* priv;
|
|
|
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if(!(sh_audio = demuxer->audio->sh))
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|
return;
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|
s = demuxer->stream;
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|
priv = demuxer->priv;
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|
|
|
if(priv->frmt == MP3 && hr_mp3_seek && !(flags & 2)) {
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|
len = (flags & 1) ? rel_seek_secs - priv->last_pts : rel_seek_secs;
|
|
if(len < 0) {
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|
stream_seek(s,demuxer->movi_start);
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|
len = priv->last_pts + len;
|
|
priv->last_pts = 0;
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|
}
|
|
if(len > 0)
|
|
high_res_mp3_seek(demuxer,len);
|
|
sh_audio->delay = priv->last_pts - (ds_tell_pts(demuxer->audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
|
|
resync_audio_stream(sh_audio);
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|
return;
|
|
}
|
|
|
|
base = flags&1 ? demuxer->movi_start : stream_tell(s);
|
|
if(flags&2)
|
|
pos = base + ((demuxer->movi_end - demuxer->movi_start)*rel_seek_secs);
|
|
else
|
|
pos = base + (rel_seek_secs*sh_audio->i_bps);
|
|
|
|
if(demuxer->movi_end && pos >= demuxer->movi_end) {
|
|
pos = demuxer->movi_end;
|
|
//sh_audio->delay = (stream_tell(s) - demuxer->movi_start)/(float)sh_audio->i_bps;
|
|
//return;
|
|
} else if(pos < demuxer->movi_start)
|
|
pos = demuxer->movi_start;
|
|
|
|
priv->last_pts = (pos-demuxer->movi_start)/(float)sh_audio->i_bps;
|
|
sh_audio->delay = priv->last_pts - (ds_tell_pts(demuxer->audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
|
|
|
|
switch(priv->frmt) {
|
|
case WAV:
|
|
pos -= (pos % (sh_audio->channels * sh_audio->samplesize) );
|
|
// We need to decrease the pts by one step to make it the "last one"
|
|
priv->last_pts -= sh_audio->wf->nAvgBytesPerSec/(float)sh_audio->i_bps;
|
|
break;
|
|
}
|
|
|
|
stream_seek(s,pos);
|
|
|
|
resync_audio_stream(sh_audio);
|
|
|
|
}
|
|
|
|
void demux_close_audio(demuxer_t* demuxer) {
|
|
da_priv_t* priv = demuxer->priv;
|
|
|
|
if(!priv)
|
|
return;
|
|
free(priv);
|
|
}
|
|
|
|
int demux_audio_control(demuxer_t *demuxer,int cmd, void *arg){
|
|
sh_audio_t *sh_audio=demuxer->audio->sh;
|
|
int audio_length = demuxer->movi_end / sh_audio->i_bps;
|
|
da_priv_t* priv = demuxer->priv;
|
|
|
|
switch(cmd) {
|
|
case DEMUXER_CTRL_GET_TIME_LENGTH:
|
|
if (audio_length<=0) return DEMUXER_CTRL_DONTKNOW;
|
|
*((unsigned long *)arg)=(unsigned long)audio_length;
|
|
return DEMUXER_CTRL_GUESS;
|
|
|
|
case DEMUXER_CTRL_GET_PERCENT_POS:
|
|
if (audio_length<=0)
|
|
return DEMUXER_CTRL_DONTKNOW;
|
|
*((int *)arg)=(int)( (priv->last_pts*100) / audio_length);
|
|
return DEMUXER_CTRL_OK;
|
|
|
|
default:
|
|
return DEMUXER_CTRL_NOTIMPL;
|
|
}
|
|
}
|