typedef struct ShortenContext {
AVCodecContext *avctx;
+ AVFrame frame;
GetBitContext gb;
int min_framesize, max_framesize;
int channels;
int32_t *decoded[MAX_CHANNELS];
+ int32_t *decoded_base[MAX_CHANNELS];
int32_t *offset[MAX_CHANNELS];
int *coeffs;
uint8_t *bitstream;
int blocksize;
int bitindex;
int32_t lpcqoffset;
+ int got_header;
+ int got_quit_command;
} ShortenContext;
static av_cold int shorten_decode_init(AVCodecContext * avctx)
{
ShortenContext *s = avctx->priv_data;
s->avctx = avctx;
- avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
+
+ avcodec_get_frame_defaults(&s->frame);
+ avctx->coded_frame = &s->frame;
return 0;
}
return AVERROR(ENOMEM);
s->offset[chan] = tmp_ptr;
- tmp_ptr = av_realloc(s->decoded[chan], sizeof(int32_t)*(s->blocksize + s->nwrap));
+ tmp_ptr = av_realloc(s->decoded_base[chan], (s->blocksize + s->nwrap) *
+ sizeof(s->decoded_base[0][0]));
if (!tmp_ptr)
return AVERROR(ENOMEM);
- s->decoded[chan] = tmp_ptr;
+ s->decoded_base[chan] = tmp_ptr;
for (i=0; i<s->nwrap; i++)
- s->decoded[chan][i] = 0;
- s->decoded[chan] += s->nwrap;
+ s->decoded_base[chan][i] = 0;
+ s->decoded[chan] = s->decoded_base[chan] + s->nwrap;
}
coeffs = av_realloc(s->coeffs, s->nwrap * sizeof(*s->coeffs));
}
-static void init_offset(ShortenContext *s)
+static int init_offset(ShortenContext *s)
{
int32_t mean = 0;
int chan, i;
break;
default:
av_log(s->avctx, AV_LOG_ERROR, "unknown audio type");
- abort();
+ return AVERROR_INVALIDDATA;
}
for (chan = 0; chan < s->channels; chan++)
for (i = 0; i < nblock; i++)
s->offset[chan][i] = mean;
+ return 0;
}
static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header,
return 0;
}
-static int16_t * interleave_buffer(int16_t *samples, int nchan, int blocksize, int32_t **buffer) {
- int i, chan;
- for (i=0; i<blocksize; i++)
- for (chan=0; chan < nchan; chan++)
- *samples++ = av_clip_int16(buffer[chan][i]);
- return samples;
+static void output_buffer(int16_t **samples, int nchan, int blocksize,
+ int32_t **buffer)
+{
+ int i, ch;
+ for (ch = 0; ch < nchan; ch++) {
+ int32_t *in = buffer[ch];
+ int16_t *out = samples[ch];
+ for (i = 0; i < blocksize; i++)
+ out[i] = av_clip_int16(in[i]);
+ }
}
static const int fixed_coeffs[3][3] = {
s->lpcqoffset = 0;
s->blocksize = DEFAULT_BLOCK_SIZE;
- s->channels = 1;
s->nmean = -1;
s->version = get_bits(&s->gb, 8);
s->internal_ftype = get_uint(s, TYPESIZE);
if ((ret = allocate_buffers(s)) < 0)
return ret;
- init_offset(s);
+ if ((ret = init_offset(s)) < 0)
+ return ret;
if (s->version > 1)
s->lpcqoffset = V2LPCQOFFSET;
s->cur_chan = 0;
s->bitshift = 0;
+ s->got_header = 1;
+
return 0;
}
-static int shorten_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- AVPacket *avpkt)
+static int shorten_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
ShortenContext *s = avctx->priv_data;
int i, input_buf_size = 0;
- int16_t *samples = data;
int ret;
/* allocate internal bitstream buffer */
memmove(s->bitstream, &s->bitstream[s->bitstream_index], s->bitstream_size);
s->bitstream_index=0;
}
- memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size], buf, buf_size);
+ if (buf)
+ memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size], buf, buf_size);
buf= &s->bitstream[s->bitstream_index];
buf_size += s->bitstream_size;
s->bitstream_size= buf_size;
- /* do not decode until buffer has at least max_framesize bytes */
- if(buf_size < s->max_framesize){
- *data_size = 0;
+ /* do not decode until buffer has at least max_framesize bytes or
+ the end of the file has been reached */
+ if (buf_size < s->max_framesize && avpkt->data) {
+ *got_frame_ptr = 0;
return input_buf_size;
}
}
skip_bits(&s->gb, s->bitindex);
/* process header or next subblock */
- if (!s->blocksize)
- {
+ if (!s->got_header) {
if ((ret = read_header(s)) < 0)
return ret;
- *data_size = 0;
+ *got_frame_ptr = 0;
+ goto finish_frame;
}
- else
- {
+
+ /* if quit command was read previously, don't decode anything */
+ if (s->got_quit_command) {
+ *got_frame_ptr = 0;
+ return avpkt->size;
+ }
+
+ s->cur_chan = 0;
+ while (s->cur_chan < s->channels) {
int cmd;
int len;
+
+ if (get_bits_left(&s->gb) < 3+FNSIZE) {
+ *got_frame_ptr = 0;
+ break;
+ }
+
cmd = get_ur_golomb_shorten(&s->gb, FNSIZE);
if (cmd > FN_VERBATIM) {
av_log(avctx, AV_LOG_ERROR, "unknown shorten function %d\n", cmd);
- if (s->bitstream_size > 0) {
- s->bitstream_index++;
- s->bitstream_size--;
- }
- return -1;
+ *got_frame_ptr = 0;
+ break;
}
if (!is_audio_command[cmd]) {
break;
}
case FN_QUIT:
+ s->got_quit_command = 1;
break;
}
- *data_size = 0;
+ if (cmd == FN_BLOCKSIZE || cmd == FN_QUIT) {
+ *got_frame_ptr = 0;
+ break;
+ }
} else {
/* process audio command */
int residual_size = 0;
/* if this is the last channel in the block, output the samples */
s->cur_chan++;
if (s->cur_chan == s->channels) {
- int out_size = s->blocksize * s->channels *
- av_get_bytes_per_sample(avctx->sample_fmt);
- if (*data_size < out_size) {
- av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n");
- return AVERROR(EINVAL);
+ /* get output buffer */
+ s->frame.nb_samples = s->blocksize;
+ if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
}
- samples = interleave_buffer(samples, s->channels, s->blocksize, s->decoded);
- s->cur_chan = 0;
- *data_size = out_size;
- } else {
- *data_size = 0;
+ /* interleave output */
+ output_buffer((int16_t **)s->frame.extended_data, s->channels,
+ s->blocksize, s->decoded);
+
+ *got_frame_ptr = 1;
+ *(AVFrame *)data = s->frame;
}
}
}
+ if (s->cur_chan < s->channels)
+ *got_frame_ptr = 0;
+finish_frame:
s->bitindex = get_bits_count(&s->gb) - 8*((get_bits_count(&s->gb))/8);
i= (get_bits_count(&s->gb))/8;
if (i > buf_size) {
int i;
for (i = 0; i < s->channels; i++) {
- s->decoded[i] -= s->nwrap;
- av_freep(&s->decoded[i]);
+ s->decoded[i] = NULL;
+ av_freep(&s->decoded_base[i]);
av_freep(&s->offset[i]);
}
av_freep(&s->bitstream);
av_freep(&s->coeffs);
+
return 0;
}
AVCodec ff_shorten_decoder = {
.name = "shorten",
.type = AVMEDIA_TYPE_AUDIO,
- .id = CODEC_ID_SHORTEN,
+ .id = AV_CODEC_ID_SHORTEN,
.priv_data_size = sizeof(ShortenContext),
.init = shorten_decode_init,
.close = shorten_decode_close,
.decode = shorten_decode_frame,
- .long_name= NULL_IF_CONFIG_SMALL("Shorten"),
+ .capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Shorten"),
+ .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
+ AV_SAMPLE_FMT_NONE },
};
projects / ffmpeg / blobdiff