mirror of
https://github.com/nyanmisaka/ffmpeg-rockchip.git
synced 2025-12-24 11:52:06 +08:00
loosen dependencies over mpegaudiodec
Originally committed as revision 9080 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs
@@ -42,6 +42,7 @@
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#endif
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#include "mpegaudio.h"
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#include "mpegaudiodecheader.h"
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#include "mathops.h"
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@@ -57,41 +58,6 @@
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/****************/
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#define HEADER_SIZE 4
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#define BACKSTEP_SIZE 512
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#define EXTRABYTES 24
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struct GranuleDef;
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typedef struct MPADecodeContext {
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DECLARE_ALIGNED_8(uint8_t, last_buf[2*BACKSTEP_SIZE + EXTRABYTES]);
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int last_buf_size;
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int frame_size;
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/* next header (used in free format parsing) */
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uint32_t free_format_next_header;
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int error_protection;
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int layer;
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int sample_rate;
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int sample_rate_index; /* between 0 and 8 */
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int bit_rate;
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GetBitContext gb;
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GetBitContext in_gb;
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int nb_channels;
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int mode;
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int mode_ext;
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int lsf;
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DECLARE_ALIGNED_16(MPA_INT, synth_buf[MPA_MAX_CHANNELS][512 * 2]);
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int synth_buf_offset[MPA_MAX_CHANNELS];
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DECLARE_ALIGNED_16(int32_t, sb_samples[MPA_MAX_CHANNELS][36][SBLIMIT]);
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int32_t mdct_buf[MPA_MAX_CHANNELS][SBLIMIT * 18]; /* previous samples, for layer 3 MDCT */
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#ifdef DEBUG
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int frame_count;
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#endif
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void (*compute_antialias)(struct MPADecodeContext *s, struct GranuleDef *g);
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int adu_mode; ///< 0 for standard mp3, 1 for adu formatted mp3
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int dither_state;
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int error_resilience;
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AVCodecContext* avctx;
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} MPADecodeContext;
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/**
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* Context for MP3On4 decoder
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@@ -1107,124 +1073,6 @@ static void imdct36(int *out, int *buf, int *in, int *win)
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buf[8 - 4] = MULH(t0, win[18 + 8 - 4]);
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}
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/* header decoding. MUST check the header before because no
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consistency check is done there. Return 1 if free format found and
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that the frame size must be computed externally */
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static int decode_header(MPADecodeContext *s, uint32_t header)
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{
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int sample_rate, frame_size, mpeg25, padding;
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int sample_rate_index, bitrate_index;
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if (header & (1<<20)) {
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s->lsf = (header & (1<<19)) ? 0 : 1;
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mpeg25 = 0;
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} else {
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s->lsf = 1;
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mpeg25 = 1;
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}
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s->layer = 4 - ((header >> 17) & 3);
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/* extract frequency */
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sample_rate_index = (header >> 10) & 3;
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sample_rate = ff_mpa_freq_tab[sample_rate_index] >> (s->lsf + mpeg25);
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sample_rate_index += 3 * (s->lsf + mpeg25);
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s->sample_rate_index = sample_rate_index;
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s->error_protection = ((header >> 16) & 1) ^ 1;
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s->sample_rate = sample_rate;
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bitrate_index = (header >> 12) & 0xf;
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padding = (header >> 9) & 1;
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//extension = (header >> 8) & 1;
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s->mode = (header >> 6) & 3;
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s->mode_ext = (header >> 4) & 3;
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//copyright = (header >> 3) & 1;
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//original = (header >> 2) & 1;
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//emphasis = header & 3;
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if (s->mode == MPA_MONO)
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s->nb_channels = 1;
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else
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s->nb_channels = 2;
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if (bitrate_index != 0) {
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frame_size = ff_mpa_bitrate_tab[s->lsf][s->layer - 1][bitrate_index];
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s->bit_rate = frame_size * 1000;
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switch(s->layer) {
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case 1:
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frame_size = (frame_size * 12000) / sample_rate;
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frame_size = (frame_size + padding) * 4;
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break;
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case 2:
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frame_size = (frame_size * 144000) / sample_rate;
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frame_size += padding;
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break;
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default:
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case 3:
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frame_size = (frame_size * 144000) / (sample_rate << s->lsf);
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frame_size += padding;
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break;
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}
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s->frame_size = frame_size;
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} else {
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/* if no frame size computed, signal it */
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return 1;
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}
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#if defined(DEBUG)
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dprintf(s->avctx, "layer%d, %d Hz, %d kbits/s, ",
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s->layer, s->sample_rate, s->bit_rate);
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if (s->nb_channels == 2) {
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if (s->layer == 3) {
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if (s->mode_ext & MODE_EXT_MS_STEREO)
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dprintf(s->avctx, "ms-");
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if (s->mode_ext & MODE_EXT_I_STEREO)
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dprintf(s->avctx, "i-");
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}
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dprintf(s->avctx, "stereo");
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} else {
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dprintf(s->avctx, "mono");
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}
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dprintf(s->avctx, "\n");
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#endif
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return 0;
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}
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/* useful helper to get mpeg audio stream infos. Return -1 if error in
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header, otherwise the coded frame size in bytes */
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int mpa_decode_header(AVCodecContext *avctx, uint32_t head, int *sample_rate)
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{
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MPADecodeContext s1, *s = &s1;
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s1.avctx = avctx;
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if (ff_mpa_check_header(head) != 0)
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return -1;
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if (decode_header(s, head) != 0) {
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return -1;
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}
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switch(s->layer) {
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case 1:
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avctx->frame_size = 384;
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break;
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case 2:
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avctx->frame_size = 1152;
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break;
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default:
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case 3:
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if (s->lsf)
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avctx->frame_size = 576;
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else
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avctx->frame_size = 1152;
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break;
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}
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*sample_rate = s->sample_rate;
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avctx->channels = s->nb_channels;
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avctx->bit_rate = s->bit_rate;
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avctx->sub_id = s->layer;
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return s->frame_size;
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}
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/* return the number of decoded frames */
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static int mp_decode_layer1(MPADecodeContext *s)
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{
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