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-rw-r--r--libavcodec/wmavoice.c144
1 files changed, 29 insertions, 115 deletions
diff --git a/libavcodec/wmavoice.c b/libavcodec/wmavoice.c
index 4b3ab431c3..ae100fb39b 100644
--- a/libavcodec/wmavoice.c
+++ b/libavcodec/wmavoice.c
@@ -251,6 +251,7 @@ typedef struct WMAVoiceContext {
int frame_cntr; ///< current frame index [0 - 0xFFFE]; is
///< only used for comfort noise in #pRNG()
+ int nb_superframes; ///< number of superframes in current packet
float gain_pred_err[6]; ///< cache for gain prediction
float excitation_history[MAX_SIGNAL_HISTORY];
///< cache of the signal of previous
@@ -875,7 +876,6 @@ static void dequant_lsps(double *lsps, int num,
/**
* @name LSP dequantization routines
* LSP dequantization routines, for 10/16LSPs and independent/residual coding.
- * @note we assume enough bits are available, caller should check.
* lsp10i() consumes 24 bits; lsp10r() consumes an additional 24 bits;
* lsp16i() consumes 34 bits; lsp16r() consumes an additional 26 bits.
* @{
@@ -1419,7 +1419,6 @@ static void synth_block_fcb_acb(WMAVoiceContext *s, GetBitContext *gb,
/**
* Parse data in a single block.
- * @note we assume enough bits are available, caller should check.
*
* @param s WMA Voice decoding context private data
* @param gb bit I/O context
@@ -1463,7 +1462,6 @@ static void synth_block(WMAVoiceContext *s, GetBitContext *gb,
/**
* Synthesize output samples for a single frame.
- * @note we assume enough bits are available, caller should check.
*
* @param ctx WMA Voice decoder context
* @param gb bit I/O context (s->gb or one for cross-packet superframes)
@@ -1682,83 +1680,6 @@ static void stabilize_lsps(double *lsps, int num)
}
/**
- * Test if there's enough bits to read 1 superframe.
- *
- * @param orig_gb bit I/O context used for reading. This function
- * does not modify the state of the bitreader; it
- * only uses it to copy the current stream position
- * @param s WMA Voice decoding context private data
- * @return < 0 on error, 1 on not enough bits or 0 if OK.
- */
-static int check_bits_for_superframe(GetBitContext *orig_gb,
- WMAVoiceContext *s)
-{
- GetBitContext s_gb, *gb = &s_gb;
- int n, need_bits, bd_idx;
- const struct frame_type_desc *frame_desc;
-
- /* initialize a copy */
- init_get_bits(gb, orig_gb->buffer, orig_gb->size_in_bits);
- skip_bits_long(gb, get_bits_count(orig_gb));
- av_assert1(get_bits_left(gb) == get_bits_left(orig_gb));
-
- /* superframe header */
- if (get_bits_left(gb) < 14)
- return 1;
- if (!get_bits1(gb))
- return AVERROR(ENOSYS); // WMAPro-in-WMAVoice superframe
- if (get_bits1(gb)) skip_bits(gb, 12); // number of samples in superframe
- if (s->has_residual_lsps) { // residual LSPs (for all frames)
- if (get_bits_left(gb) < s->sframe_lsp_bitsize)
- return 1;
- skip_bits_long(gb, s->sframe_lsp_bitsize);
- }
-
- /* frames */
- for (n = 0; n < MAX_FRAMES; n++) {
- int aw_idx_is_ext = 0;
-
- if (!s->has_residual_lsps) { // independent LSPs (per-frame)
- if (get_bits_left(gb) < s->frame_lsp_bitsize) return 1;
- skip_bits_long(gb, s->frame_lsp_bitsize);
- }
- bd_idx = s->vbm_tree[get_vlc2(gb, frame_type_vlc.table, 6, 3)];
- if (bd_idx < 0)
- return AVERROR_INVALIDDATA; // invalid frame type VLC code
- frame_desc = &frame_descs[bd_idx];
- if (frame_desc->acb_type == ACB_TYPE_ASYMMETRIC) {
- if (get_bits_left(gb) < s->pitch_nbits)
- return 1;
- skip_bits_long(gb, s->pitch_nbits);
- }
- if (frame_desc->fcb_type == FCB_TYPE_SILENCE) {
- skip_bits(gb, 8);
- } else if (frame_desc->fcb_type == FCB_TYPE_AW_PULSES) {
- int tmp = get_bits(gb, 6);
- if (tmp >= 0x36) {
- skip_bits(gb, 2);
- aw_idx_is_ext = 1;
- }
- }
-
- /* blocks */
- if (frame_desc->acb_type == ACB_TYPE_HAMMING) {
- need_bits = s->block_pitch_nbits +
- (frame_desc->n_blocks - 1) * s->block_delta_pitch_nbits;
- } else if (frame_desc->fcb_type == FCB_TYPE_AW_PULSES) {
- need_bits = 2 * !aw_idx_is_ext;
- } else
- need_bits = 0;
- need_bits += frame_desc->frame_size;
- if (get_bits_left(gb) < need_bits)
- return 1;
- skip_bits_long(gb, need_bits);
- }
-
- return 0;
-}
-
-/**
* Synthesize output samples for a single superframe. If we have any data
* cached in s->sframe_cache, that will be used instead of whatever is loaded
* in s->gb.
@@ -1780,7 +1701,7 @@ static int synth_superframe(AVCodecContext *ctx, AVFrame *frame,
{
WMAVoiceContext *s = ctx->priv_data;
GetBitContext *gb = &s->gb, s_gb;
- int n, res, n_samples = 480;
+ int n, res, n_samples = MAX_SFRAMESIZE;
double lsps[MAX_FRAMES][MAX_LSPS];
const double *mean_lsf = s->lsps == 16 ?
wmavoice_mean_lsf16[s->lsp_def_mode] : wmavoice_mean_lsf10[s->lsp_def_mode];
@@ -1799,12 +1720,6 @@ static int synth_superframe(AVCodecContext *ctx, AVFrame *frame,
s->sframe_cache_size = 0;
}
- if ((res = check_bits_for_superframe(gb, s)) == 1) {
- *got_frame_ptr = 0;
- return 1;
- } else if (res < 0)
- return res;
-
/* First bit is speech/music bit, it differentiates between WMAVoice
* speech samples (the actual codec) and WMAVoice music samples, which
* are really WMAPro-in-WMAVoice-superframes. I've never seen those in
@@ -1816,13 +1731,14 @@ static int synth_superframe(AVCodecContext *ctx, AVFrame *frame,
/* (optional) nr. of samples in superframe; always <= 480 and >= 0 */
if (get_bits1(gb)) {
- if ((n_samples = get_bits(gb, 12)) > 480) {
+ if ((n_samples = get_bits(gb, 12)) > MAX_SFRAMESIZE) {
av_log(ctx, AV_LOG_ERROR,
- "Superframe encodes >480 samples (%d), not allowed\n",
- n_samples);
+ "Superframe encodes > %d samples (%d), not allowed\n",
+ MAX_SFRAMESIZE, n_samples);
return AVERROR_INVALIDDATA;
}
}
+
/* Parse LSPs, if global for the superframe (can also be per-frame). */
if (s->has_residual_lsps) {
double prev_lsps[MAX_LSPS], a1[MAX_LSPS * 2], a2[MAX_LSPS * 2];
@@ -1845,7 +1761,7 @@ static int synth_superframe(AVCodecContext *ctx, AVFrame *frame,
}
/* get output buffer */
- frame->nb_samples = 480;
+ frame->nb_samples = MAX_SFRAMESIZE;
if ((res = ff_get_buffer(ctx, frame, 0)) < 0)
return res;
frame->nb_samples = n_samples;
@@ -1905,26 +1821,23 @@ static int synth_superframe(AVCodecContext *ctx, AVFrame *frame,
* decoder).
*
* @param s WMA Voice decoding context private data
- * @return 1 if not enough bits were available, or 0 on success.
+ * @return <0 on error, nb_superframes on success.
*/
static int parse_packet_header(WMAVoiceContext *s)
{
GetBitContext *gb = &s->gb;
- unsigned int res;
+ unsigned int res, n_superframes = 0;
- if (get_bits_left(gb) < 11)
- return 1;
skip_bits(gb, 4); // packet sequence number
s->has_residual_lsps = get_bits1(gb);
do {
res = get_bits(gb, 6); // number of superframes per packet
// (minus first one if there is spillover)
- if (get_bits_left(gb) < 6 * (res == 0x3F) + s->spillover_bitsize)
- return 1;
+ n_superframes += res;
} while (res == 0x3F);
s->spillover_nbits = get_bits(gb, s->spillover_bitsize);
- return 0;
+ return get_bits_left(gb) >= 0 ? n_superframes : AVERROR_INVALIDDATA;
}
/**
@@ -1984,23 +1897,24 @@ static int wmavoice_decode_packet(AVCodecContext *ctx, void *data,
* in a single "muxer" packet, so we artificially emulate that by
* capping the packet size at ctx->block_align. */
for (size = avpkt->size; size > ctx->block_align; size -= ctx->block_align);
- if (!size) {
- *got_frame_ptr = 0;
- return 0;
- }
init_get_bits(&s->gb, avpkt->data, size << 3);
/* size == ctx->block_align is used to indicate whether we are dealing with
* a new packet or a packet of which we already read the packet header
* previously. */
- if (size == ctx->block_align) { // new packet header
- if ((res = parse_packet_header(s)) < 0)
- return res;
+ if (!(size % ctx->block_align)) { // new packet header
+ if (!size) {
+ s->spillover_nbits = 0;
+ s->nb_superframes = 0;
+ } else {
+ if ((res = parse_packet_header(s)) < 0)
+ return res;
+ s->nb_superframes = res;
+ }
/* If the packet header specifies a s->spillover_nbits, then we want
* to push out all data of the previous packet (+ spillover) before
* continuing to parse new superframes in the current packet. */
- if (s->spillover_nbits > 0) {
if (s->sframe_cache_size > 0) {
int cnt = get_bits_count(gb);
copy_bits(&s->pb, avpkt->data, size, gb, s->spillover_nbits);
@@ -2021,9 +1935,9 @@ static int wmavoice_decode_packet(AVCodecContext *ctx, void *data,
} else
skip_bits_long (gb, s->spillover_nbits - cnt +
get_bits_count(gb)); // resync
- } else
+ } else if (s->spillover_nbits) {
skip_bits_long(gb, s->spillover_nbits); // resync
- }
+ }
} else if (s->skip_bits_next)
skip_bits(gb, s->skip_bits_next);
@@ -2031,6 +1945,10 @@ static int wmavoice_decode_packet(AVCodecContext *ctx, void *data,
s->sframe_cache_size = 0;
s->skip_bits_next = 0;
pos = get_bits_left(gb);
+ if (s->nb_superframes-- == 0) {
+ *got_frame_ptr = 0;
+ return size;
+ } else if (s->nb_superframes > 0) {
if ((res = synth_superframe(ctx, data, got_frame_ptr)) < 0) {
return res;
} else if (*got_frame_ptr) {
@@ -2044,13 +1962,9 @@ static int wmavoice_decode_packet(AVCodecContext *ctx, void *data,
return AVERROR_INVALIDDATA;
}
return res;
+ }
} else if ((s->sframe_cache_size = pos) > 0) {
- /* rewind bit reader to start of last (incomplete) superframe... */
- init_get_bits(gb, avpkt->data, size << 3);
- skip_bits_long(gb, (size << 3) - pos);
- av_assert1(get_bits_left(gb) == pos);
-
- /* ...and cache it for spillover in next packet */
+ /* ... cache it for spillover in next packet */
init_put_bits(&s->pb, s->sframe_cache, SFRAME_CACHE_MAXSIZE);
copy_bits(&s->pb, avpkt->data, size, gb, s->sframe_cache_size);
// FIXME bad - just copy bytes as whole and add use the
@@ -2084,6 +1998,6 @@ AVCodec ff_wmavoice_decoder = {
.init_static_data = wmavoice_init_static_data,
.close = wmavoice_decode_end,
.decode = wmavoice_decode_packet,
- .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
+ .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
.flush = wmavoice_flush,
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-28 04:32:11 +0000