adding ffmpeg specific version

1 files changed, 188 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/h264_mp4toannexb_bsf.c b/ffmpeg1/libavcodec/h264_mp4toannexb_bsf.c
new file mode 100644
index 0000000..2dea933
--- /dev/null
+++ b/ffmpeg1/libavcodec/h264_mp4toannexb_bsf.c
@@ -0,0 +1,188 @@
+/*
+ * H.264 MP4 to Annex B byte stream format filter
+ * Copyright (c) 2007 Benoit Fouet <benoit.fouet@free.fr>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <string.h>
+
+#include "libavutil/intreadwrite.h"
+#include "libavutil/mem.h"
+#include "avcodec.h"
+
+typedef struct H264BSFContext {
+    uint8_t  length_size;
+    uint8_t  first_idr;
+    int      extradata_parsed;
+} H264BSFContext;
+
+static int alloc_and_copy(uint8_t **poutbuf,          int *poutbuf_size,
+                          const uint8_t *sps_pps, uint32_t sps_pps_size,
+                          const uint8_t *in,      uint32_t in_size) {
+    uint32_t offset = *poutbuf_size;
+    uint8_t nal_header_size = offset ? 3 : 4;
+    void *tmp;
+
+    *poutbuf_size += sps_pps_size+in_size+nal_header_size;
+    tmp = av_realloc(*poutbuf, *poutbuf_size);
+    if (!tmp)
+        return AVERROR(ENOMEM);
+    *poutbuf = tmp;
+    if (sps_pps)
+        memcpy(*poutbuf+offset, sps_pps, sps_pps_size);
+    memcpy(*poutbuf+sps_pps_size+nal_header_size+offset, in, in_size);
+    if (!offset) {
+        AV_WB32(*poutbuf+sps_pps_size, 1);
+    } else {
+        (*poutbuf+offset+sps_pps_size)[0] = (*poutbuf+offset+sps_pps_size)[1] = 0;
+        (*poutbuf+offset+sps_pps_size)[2] = 1;
+    }
+
+    return 0;
+}
+
+static int h264_mp4toannexb_filter(AVBitStreamFilterContext *bsfc,
+                                   AVCodecContext *avctx, const char *args,
+                                   uint8_t  **poutbuf, int *poutbuf_size,
+                                   const uint8_t *buf, int      buf_size,
+                                   int keyframe) {
+    H264BSFContext *ctx = bsfc->priv_data;
+    int i;
+    uint8_t unit_type;
+    int32_t nal_size;
+    uint32_t cumul_size = 0;
+    const uint8_t *buf_end = buf + buf_size;
+    int ret = AVERROR(EINVAL);
+
+    /* nothing to filter */
+    if (!avctx->extradata || avctx->extradata_size < 6) {
+        *poutbuf = (uint8_t*) buf;
+        *poutbuf_size = buf_size;
+        return 0;
+    }
+
+    /* retrieve sps and pps NAL units from extradata */
+    if (!ctx->extradata_parsed) {
+        uint16_t unit_size;
+        uint64_t total_size = 0;
+        uint8_t *out = NULL, unit_nb, sps_done = 0, sps_seen = 0, pps_seen = 0;
+        const uint8_t *extradata = avctx->extradata+4;
+        static const uint8_t nalu_header[4] = {0, 0, 0, 1};
+
+        /* retrieve length coded size */
+        ctx->length_size = (*extradata++ & 0x3) + 1;
+
+        /* retrieve sps and pps unit(s) */
+        unit_nb = *extradata++ & 0x1f; /* number of sps unit(s) */
+        if (!unit_nb) {
+            goto pps;
+        } else {
+            sps_seen = 1;
+        }
+
+        while (unit_nb--) {
+            void *tmp;
+
+            unit_size = AV_RB16(extradata);
+            total_size += unit_size+4;
+            if (total_size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE ||
+                extradata+2+unit_size > avctx->extradata+avctx->extradata_size) {
+                av_free(out);
+                return AVERROR(EINVAL);
+            }
+            tmp = av_realloc(out, total_size + FF_INPUT_BUFFER_PADDING_SIZE);
+            if (!tmp) {
+                av_free(out);
+                return AVERROR(ENOMEM);
+            }
+            out = tmp;
+            memcpy(out+total_size-unit_size-4, nalu_header, 4);
+            memcpy(out+total_size-unit_size,   extradata+2, unit_size);
+            extradata += 2+unit_size;
+pps:
+            if (!unit_nb && !sps_done++) {
+                unit_nb = *extradata++; /* number of pps unit(s) */
+                if (unit_nb)
+                    pps_seen = 1;
+            }
+        }
+
+        if(out)
+            memset(out + total_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+
+        if (!sps_seen)
+            av_log(avctx, AV_LOG_WARNING, "Warning: SPS NALU missing or invalid. The resulting stream may not play.\n");
+        if (!pps_seen)
+            av_log(avctx, AV_LOG_WARNING, "Warning: PPS NALU missing or invalid. The resulting stream may not play.\n");
+
+        av_free(avctx->extradata);
+        avctx->extradata      = out;
+        avctx->extradata_size = total_size;
+        ctx->first_idr        = 1;
+        ctx->extradata_parsed = 1;
+    }
+
+    *poutbuf_size = 0;
+    *poutbuf = NULL;
+    do {
+        ret= AVERROR(EINVAL);
+        if (buf + ctx->length_size > buf_end)
+            goto fail;
+
+        for (nal_size = 0, i = 0; i<ctx->length_size; i++)
+            nal_size = (nal_size << 8) | buf[i];
+
+        buf += ctx->length_size;
+        unit_type = *buf & 0x1f;
+
+        if (buf + nal_size > buf_end || nal_size < 0)
+            goto fail;
+
+        /* prepend only to the first type 5 NAL unit of an IDR picture */
+        if (ctx->first_idr && unit_type == 5) {
+            if ((ret=alloc_and_copy(poutbuf, poutbuf_size,
+                               avctx->extradata, avctx->extradata_size,
+                               buf, nal_size)) < 0)
+                goto fail;
+            ctx->first_idr = 0;
+        } else {
+            if ((ret=alloc_and_copy(poutbuf, poutbuf_size,
+                               NULL, 0,
+                               buf, nal_size)) < 0)
+                goto fail;
+            if (!ctx->first_idr && unit_type == 1)
+                ctx->first_idr = 1;
+        }
+
+        buf += nal_size;
+        cumul_size += nal_size + ctx->length_size;
+    } while (cumul_size < buf_size);
+
+    return 1;
+
+fail:
+    av_freep(poutbuf);
+    *poutbuf_size = 0;
+    return ret;
+}
+
+AVBitStreamFilter ff_h264_mp4toannexb_bsf = {
+    "h264_mp4toannexb",
+    sizeof(H264BSFContext),
+    h264_mp4toannexb_filter,
+};