diff --git a/libavcodec/mpc.c b/libavcodec/mpc.c index dcecb0ee5a..df009f4876 100644 --- a/libavcodec/mpc.c +++ b/libavcodec/mpc.c @@ -51,6 +51,7 @@ typedef struct { int lastframelen, bands; int oldDSCF[2][BANDS]; int rnd; + int frames_to_skip; /* for synthesis */ DECLARE_ALIGNED_16(MPA_INT, synth_buf[MPA_MAX_CHANNELS][512*2]); int synth_buf_offset[MPA_MAX_CHANNELS]; @@ -98,6 +99,7 @@ static int mpc7_decode_init(AVCodecContext * avctx) c->lastframelen = get_bits(&gb, 11); av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n", c->IS, c->MSS, c->gapless, c->lastframelen, c->bands); + c->frames_to_skip = 0; if(vlc_inited) return 0; av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); @@ -328,11 +330,23 @@ static int mpc7_decode_frame(AVCodecContext * avctx, av_log(NULL,0, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail); return -1; } + if(c->frames_to_skip){ + c->frames_to_skip--; + *data_size = 0; + return buf_size; + } *data_size = (buf[1] ? c->lastframelen : MPC_FRAME_SIZE) * 4; return buf_size; } +static void mpc7_decode_flush(AVCodecContext *avctx) +{ + MPCContext *c = avctx->priv_data; + + memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); + c->frames_to_skip = 32; +} AVCodec mpc7_decoder = { "mpc sv7", @@ -343,4 +357,5 @@ AVCodec mpc7_decoder = { NULL, NULL, mpc7_decode_frame, + .flush = mpc7_decode_flush, }; diff --git a/libavformat/mpc.c b/libavformat/mpc.c index f06cba7629..8b2358ea48 100644 --- a/libavformat/mpc.c +++ b/libavformat/mpc.c @@ -22,6 +22,7 @@ #include "bitstream.h" #define MPC_FRAMESIZE 1152 +#define DELAY_FRAMES 32 static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 }; typedef struct { @@ -155,6 +156,7 @@ static int mpc_read_packet(AVFormatContext *s, AVPacket *pkt) pkt->data[1] = (c->curframe > c->fcount); pkt->stream_index = 0; + pkt->pts = cur; ret = get_buffer(&s->pb, pkt->data + 4, size); if(c->curbits) url_fseek(&s->pb, -4, SEEK_CUR); @@ -188,7 +190,7 @@ static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp MPCContext *c = s->priv_data; AVPacket pkt1, *pkt = &pkt1; int ret; - int index = av_index_search_timestamp(st, timestamp, flags); + int index = av_index_search_timestamp(st, timestamp - DELAY_FRAMES, flags); uint32_t lastframe; /* if found, seek there */ @@ -199,6 +201,7 @@ static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp /* if timestamp is out of bounds, return error */ if(timestamp < 0 || timestamp >= c->fcount) return -1; + timestamp -= DELAY_FRAMES; /* seek to the furthest known position and read packets until we reach desired position */ lastframe = c->curframe;