mirror of https://git.ffmpeg.org/ffmpeg.git
Remove useless buffering of input data, so that avcodec_decode_audio never
returns 0 for a valid frame Patch by Thorsten Jordan (tjordan atay macrosystem otday de) [FFmpeg-devel] Behaviour of liba52 decoder Originally committed as revision 11926 to svn://svn.ffmpeg.org/ffmpeg/trunk
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6a1f4535f8
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95e5323510
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@ -37,9 +37,6 @@ static const char* liba52name = "liba52.so.0";
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* released under the GPL license.
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* released under the GPL license.
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*/
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*/
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typedef struct AC3DecodeState {
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typedef struct AC3DecodeState {
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uint8_t inbuf[4096]; /* input buffer */
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uint8_t *inbuf_ptr;
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int frame_size;
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int flags;
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int flags;
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int channels;
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int channels;
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a52_state_t* state;
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a52_state_t* state;
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@ -114,8 +111,6 @@ static int a52_decode_init(AVCodecContext *avctx)
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#endif
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#endif
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s->state = s->a52_init(0); /* later use CPU flags */
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s->state = s->a52_init(0); /* later use CPU flags */
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s->samples = s->a52_samples(s->state);
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s->samples = s->a52_samples(s->state);
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s->inbuf_ptr = s->inbuf;
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s->frame_size = 0;
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/* allow downmixing to stereo or mono */
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/* allow downmixing to stereo or mono */
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if (avctx->channels > 0 && avctx->request_channels > 0 &&
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if (avctx->channels > 0 && avctx->request_channels > 0 &&
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@ -150,7 +145,6 @@ static int a52_decode_frame(AVCodecContext *avctx,
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uint8_t *buf, int buf_size)
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uint8_t *buf, int buf_size)
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{
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{
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AC3DecodeState *s = avctx->priv_data;
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AC3DecodeState *s = avctx->priv_data;
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uint8_t *buf_ptr;
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int flags, i, len;
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int flags, i, len;
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int sample_rate, bit_rate;
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int sample_rate, bit_rate;
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short *out_samples = data;
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short *out_samples = data;
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@ -161,26 +155,19 @@ static int a52_decode_frame(AVCodecContext *avctx,
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*data_size= 0;
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*data_size= 0;
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buf_ptr = buf;
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if (buf_size < HEADER_SIZE) {
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while (buf_size > 0) {
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av_log(avctx, AV_LOG_ERROR, "Error decoding frame, not enough bytes for header\n");
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len = s->inbuf_ptr - s->inbuf;
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return -1;
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if (s->frame_size == 0) {
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}
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/* no header seen : find one. We need at least 7 bytes to parse it */
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len = s->a52_syncinfo(buf, &s->flags, &sample_rate, &bit_rate);
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len = HEADER_SIZE - len;
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if (len > buf_size)
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len = buf_size;
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memcpy(s->inbuf_ptr, buf_ptr, len);
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buf_ptr += len;
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s->inbuf_ptr += len;
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buf_size -= len;
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if ((s->inbuf_ptr - s->inbuf) == HEADER_SIZE) {
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len = s->a52_syncinfo(s->inbuf, &s->flags, &sample_rate, &bit_rate);
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if (len == 0) {
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if (len == 0) {
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/* no sync found : move by one byte (inefficient, but simple!) */
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av_log(avctx, AV_LOG_ERROR, "Error decoding frame, no sync byte at begin\n");
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memcpy(s->inbuf, s->inbuf + 1, HEADER_SIZE - 1);
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return -1;
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s->inbuf_ptr--;
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}
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} else {
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if (buf_size < len) {
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s->frame_size = len;
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av_log(avctx, AV_LOG_ERROR, "Error decoding frame, not enough bytes\n");
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return -1;
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}
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/* update codec info */
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/* update codec info */
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avctx->sample_rate = sample_rate;
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avctx->sample_rate = sample_rate;
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s->channels = ac3_channels[s->flags & 7];
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s->channels = ac3_channels[s->flags & 7];
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@ -194,18 +181,6 @@ static int a52_decode_frame(AVCodecContext *avctx,
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avctx->channels = s->channels;
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avctx->channels = s->channels;
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}
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}
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avctx->bit_rate = bit_rate;
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avctx->bit_rate = bit_rate;
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}
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}
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} else if (len < s->frame_size) {
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len = s->frame_size - len;
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if (len > buf_size)
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len = buf_size;
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memcpy(s->inbuf_ptr, buf_ptr, len);
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buf_ptr += len;
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s->inbuf_ptr += len;
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buf_size -= len;
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} else {
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flags = s->flags;
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flags = s->flags;
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if (avctx->channels == 1)
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if (avctx->channels == 1)
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flags = A52_MONO;
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flags = A52_MONO;
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@ -214,25 +189,18 @@ static int a52_decode_frame(AVCodecContext *avctx,
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else
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else
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flags |= A52_ADJUST_LEVEL;
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flags |= A52_ADJUST_LEVEL;
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level = 1;
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level = 1;
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if (s->a52_frame(s->state, s->inbuf, &flags, &level, 384)) {
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if (s->a52_frame(s->state, buf, &flags, &level, 384)) {
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fail:
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fail:
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av_log(avctx, AV_LOG_ERROR, "Error decoding frame\n");
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av_log(avctx, AV_LOG_ERROR, "Error decoding frame\n");
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s->inbuf_ptr = s->inbuf;
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return -1;
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s->frame_size = 0;
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continue;
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}
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}
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for (i = 0; i < 6; i++) {
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for (i = 0; i < 6; i++) {
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if (s->a52_block(s->state))
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if (s->a52_block(s->state))
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goto fail;
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goto fail;
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float_to_int(s->samples, out_samples + i * 256 * avctx->channels, avctx->channels);
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float_to_int(s->samples, out_samples + i * 256 * avctx->channels, avctx->channels);
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}
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}
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s->inbuf_ptr = s->inbuf;
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s->frame_size = 0;
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*data_size = 6 * avctx->channels * 256 * sizeof(int16_t);
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*data_size = 6 * avctx->channels * 256 * sizeof(int16_t);
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break;
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return len;
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}
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}
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return buf_ptr - buf;
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}
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}
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static int a52_decode_end(AVCodecContext *avctx)
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static int a52_decode_end(AVCodecContext *avctx)
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